light
1 Americannoun
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something that makes things visible or affords illumination.
All colors depend on light.
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Physics.
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Also called radiant energy, luminous energy. electromagnetic radiation to which the organs of sight react, ranging in wavelength from about 400 to 700 nanometers and propagated at a speed of 186,282 miles per second (299,972 kilometers per second), considered variously as a wave, a stream of particles, or a quantum phenomenon.
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a similar form of radiant energy that does not affect the retina, as ultraviolet or infrared rays.
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the sensation produced by stimulation of the organs of sight.
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an illuminating agent or source, as the sun, a lamp, or a beacon.
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the radiance or illumination from a particular source.
the light of a candle.
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the illumination from the sun; daylight.
We awoke at the first light.
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daybreak or dawn.
when light appeared in the east.
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daytime.
Summer has more hours of light.
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a particular light or illumination in which an object seen takes on a certain appearance.
viewing the portrait in dim light.
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a device for or means of igniting, as a spark, flame, or match.
Could you give me a light?
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a traffic light.
Don't cross till the light changes.
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the aspect in which a thing appears or is regarded.
Try to look at the situation in a more cheerful light.
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the state of being visible, exposed to view, or revealed to public notice or knowledge; limelight.
Stardom has placed her in the light.
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a person who is an outstanding leader, celebrity, or example; luminary.
He became one of the leading lights of Restoration drama.
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Art.
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the effect of light falling on an object or scene as represented in a picture.
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one of the brightest parts of a picture.
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a gleam or sparkle, as in the eyes.
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a measure or supply of light; illumination.
The wall cuts off our light.
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spiritual illumination or awareness; enlightenment.
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Architecture.
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Also called day. one compartment of a window or window sash.
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a window, especially a small one.
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mental insight; understanding.
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lights, the information, ideas, or mental capacities possessed.
to act according to one's lights.
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a lighthouse.
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Archaic. the eyesight.
adjective
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lighter,
comparative
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lightest
superlative
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having light or illumination; bright; well-lighted.
the lightest room in the entire house.
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pale, whitish, or not deep or dark in color.
a light blue.
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(of coffee or tea) containing enough milk or cream to produce a light color.
verb (used with object)
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to set burning, as a candle, lamp, fire, match, or cigarette; kindle; ignite.
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to turn or switch on (an electric light).
One flick of the master switch lights all the lamps in the room.
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to give light to; furnish with light or illumination.
The room is lighted by two large chandeliers.
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to make (an area or object) bright with or as if with light (often followed byup ).
Hundreds of candles lighted up the ballroom.
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to cause (the face, surroundings, etc.) to brighten, especially with joy, animation, or the like (often followed byup ).
A smile lit up her face. Her presence lighted up the room.
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to guide or conduct with a light.
a candle to light you to bed.
verb (used without object)
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to take fire or become kindled.
The damp wood refused to light.
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to ignite a cigar, cigarette, or pipe for purposes of smoking (usually followed byup ).
He took out a pipe and lighted up before speaking.
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to become illuminated when switched on.
This table lamp won't light.
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to become bright, as with light or color (often followed byup ).
The sky lights up at sunset.
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to brighten with animation or joy, as the face or eyes (often followed byup ).
idioms
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hide one's light under a bushel, to conceal or suppress one's talents or successes.
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in a good / bad light, under favorable (or unfavorable) circumstances.
She worshiped him, but then she'd only seen him in a good light.
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see the light,
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to come into existence or being.
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to be made public.
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to begin to accept or understand a point of view one formerly opposed.
Her father was opposed to her attending an out-of-town college, but he finally saw the light.
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bring to light, to discover or reveal.
The excavations brought to light the remnants of an ancient civilization.
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in (the) light of, taking into account; because of; considering.
It was necessary to review the decision in the light of recent developments.
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come to light, to be discovered or revealed.
Some previously undiscovered letters have lately come to light.
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light at the end of the tunnel, a prospect of success, relief, or redemption.
We haven't solved the problem yet, but we're beginning to see light at the end of the tunnel.
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shed / throw light on, to clarify; clear up.
His deathbed confession threw light on a mystery of long standing.
adjective
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lighter,
comparative
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lightest
superlative
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of little weight; not heavy.
a light load.
- Antonyms:
- heavy
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of little weight in proportion to bulk; of low specific gravity.
a light metal.
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of less than the usual or average weight.
light clothing.
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weighing less than the proper or standard amount.
to be caught using light weights in trade.
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of small amount, force, intensity, etc.: a light rain;
light trading on the stock market;
a light rain;
light sleep.
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using or applying little or slight pressure or force.
The child petted the puppy with light, gentle strokes.
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not distinct; faint.
The writing on the page had become light and hard to read.
- Synonyms:
- faded, indistinct
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easy to endure, deal with, or perform; not difficult or burdensome.
light duties.
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not very profound or serious; amusing or entertaining.
light reading.
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of little importance or consequence; trivial.
The loss of his job was no light matter.
- Synonyms:
- inconsiderable, trifling
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easily digested.
light food.
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low in any substance, as sugar, starch, or tars, that is considered harmful or undesirable.
light cigarettes.
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(of alcoholic beverages)
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not heavy or strong.
a light apéritif.
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(especially of beer and wine) having fewer calories and usually a lower alcohol content than the standard product.
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spongy or well-leavened, as cake.
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(of soil) containing much sand; porous or crumbly.
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slender or delicate in form or appearance.
a light, graceful figure.
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airy or buoyant in movement.
When she dances, she's as light as a feather.
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nimble or agile.
light on one's feet.
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free from trouble, sorrow, or worry; carefree.
a light heart.
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a light laugh.
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characterized by lack of proper seriousness; frivolous.
light conduct.
- Synonyms:
- flighty
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sexually promiscuous; loose.
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easily swayed; changeable: volatile.
a heart light of love;
His is a life of a man light of purpose.
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slightly delirious; dizzy.
I get light on one martini.
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Military. lightly armed or equipped.
light cavalry.
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having little or no cargo, encumbrance, or the like; not burdened.
a light freighter drawing little water.
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adapted by small weight or slight build for small loads or swift movement.
The grocer bought a light truck for deliveries.
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using small-scale machinery primarily for the production of consumer goods.
light industry.
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Nautical. noting any sail of light canvas set only in moderate or calm weather, as a royal, skysail, studdingsail, gaff topsail, or spinnaker.
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Meteorology. (of wind) having a speed up to 7 miles per hour (3 meters per second).
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Phonetics. (of l- sounds) resembling a front vowel in quality; clear.
French l is lighter than English l.
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Prosody. (of a syllable)
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Poker. being in debt to the pot.
He's a dollar light.
adverb
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with few or no suitcases; lightly.
to travel light.
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with no load or cargo hauled or carried.
a locomotive running light to its roundhouse.
noun
idioms
verb (used without object)
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to get down or descend, as from a horse or a vehicle.
As she lighted, the journalists began shouting questions at her.
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to come to rest, as on a spot or thing; fall or settle upon; land.
The bird lighted on the branch. My eye lighted on some friends in the crowd.
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to come by chance; happen; hit (usually followed by on orupon ).
to light on a clue; to light on an ideal picnic spot.
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to fall, as a stroke, weapon, vengeance, or choice, on a place or person.
The choice lighted upon our candidate.
verb phrase
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light into to make a vigorous physical or verbal attack on.
He would light into anyone with the slightest provocation.
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light out to leave quickly; depart hurriedly.
He lit out of here as fast as his legs would carry him.
noun
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God regarded as a source of illuminating grace and strength
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Quakerism short for Inner Light
noun
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the medium of illumination that makes sight possible
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Also called: visible radiation. electromagnetic radiation that is capable of causing a visual sensation and has wavelengths from about 380 to about 780 nanometres
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(not in technical usage) electromagnetic radiation that has a wavelength outside this range, esp ultraviolet radiation
ultraviolet light
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the sensation experienced when electromagnetic radiation within the visible spectrum falls on the retina of the eye
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anything that illuminates, such as a lamp or candle
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See traffic light
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a particular quality or type of light
a good light for reading
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illumination from the sun during the day; daylight
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the time this appears; daybreak; dawn
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anything that allows the entrance of light, such as a window or compartment of a window
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the condition of being visible or known (esp in the phrases bring or come to light )
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an aspect or view
he saw it in a different light
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mental understanding or spiritual insight
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a person considered to be an authority or leader
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brightness of countenance, esp a sparkle in the eyes
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the act of igniting or kindling something, such as a cigarette
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something that ignites or kindles, esp in a specified manner, such as a spark or flame
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something used for igniting or kindling, such as a match
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See lighthouse
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the effect of illumination on objects or scenes, as created in a picture
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an area of brightness in a picture, as opposed to shade
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a poetic or archaic word for eyesight
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the answer to a clue in a crossword
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in view of; taking into account; considering
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hope for the ending of a difficult or unpleasant situation
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quickly asleep or unconscious
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to gain sudden insight into or understanding of something
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to experience a religious conversion
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to come into being
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to come to public notice
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to clarify or supply additional information on
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to stand so as to obscure a person's vision
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(verb) to ignite something, esp a match, by friction
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(interjection) an exclamation of surprise
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adjective
verb
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to ignite or cause to ignite
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(often foll by up) to illuminate or cause to illuminate
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to make or become cheerful or animated
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(tr) to guide or lead by light
adjective
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not heavy; weighing relatively little
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having relatively low density
magnesium is a light metal
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lacking sufficient weight; not agreeing with standard or official weights
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not great in degree, intensity, or number
light rain
a light eater
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without burdens, difficulties, or problems; easily borne or done
a light heart
light work
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graceful, agile, or deft
light fingers
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not bulky or clumsy
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not serious or profound; entertaining
light verse
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without importance or consequence; insignificant
no light matter
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frivolous or capricious
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loose in morals
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dizzy or unclear
a light head
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(of bread, cake, etc) spongy or well leavened
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easily digested
a light meal
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relatively low in alcoholic content
a light wine
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(of a soil) having a crumbly texture
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designed to carry light loads
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not loaded
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carrying light arms or equipment
light infantry
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(of an industry) engaged in the production of small consumer goods using light machinery Compare heavy
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aeronautics (of an aircraft) having a maximum take-off weight less than 5670 kilograms (12 500 pounds)
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chem (of an oil fraction obtained from coal tar) having a boiling range between about 100° and 210°C
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(of a railway) having a narrow gauge, or in some cases a standard gauge with speed or load restrictions not applied to a main line
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bridge
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(of a bid) made on insufficient values
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(of a player) having failed to take sufficient tricks to make his contract
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phonetics prosody (of a syllable, vowel, etc) unaccented or weakly stressed; short Compare heavy See also light 1
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phonetics the least of three levels of stress in an utterance, in such languages as English
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informal lacking a sufficient quantity of (something)
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to treat as insignificant or trifling
adverb
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a less common word for lightly
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with little equipment, baggage, etc
to travel light
verb
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(esp of birds) to settle or land after flight
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to get down from a horse, vehicle, etc
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to come upon unexpectedly
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to strike or fall on
the choice lighted on me
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Electromagnetic radiation that can be perceived by the human eye. It is made up of electromagnetic waves with wavelengths between 4 × 10 - 7 and 7 × 10 - 7 meters. Light, and all other electromagnetic radiation, travels at a speed of about 299,728 km (185,831 mi) per second in a vacuum.
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See also photon
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Electromagnetic energy of a wavelength just outside the range the human eye can detect, such as infrared light and ultraviolet light.
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See Note at electromagnetic radiation
Other Word Forms
Derived Forms
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lightnessnoun
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lightfuladjective
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lightishadjective
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lightlessadjective
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lightfullyadverb
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lightlyadverb
Inflected Forms
Adjectives
Etymology
Origin of light1
First recorded before 900; (noun and adjective) Middle English; Old English lēoht; cognate with Old Saxon lioht, Old Frisian liacht, Dutch, German licht, Gothic liuhath (noun); akin to Old Norse ljōs (noun), ljōss (adjective), Latin lūx (noun), Greek leukós “bright, white”; (verb) Middle English lighten, Old English līhtan, cognate with Old Saxon liuhtian, Old High German liuhten ( German leuchten ), Gothic liuhtjan
Origin of light2
First recorded before 900; Middle English; Old English lēoht, līht; cognate with Old Frisian li(u)cht, Old Saxon -līht, Dutch licht, German leicht, Old Norse lēttr, Gothic leihts
Origin of light3
First recorded before 900; Middle English lihten, Old English līhtan “to make light, relieve of a weight”; see light 2
Explanation
It's pitch black in your room so you switch on the lamp, and your room is filled with light. Light is a source of illumination, whether a natural one (like the sun) or an artificial one (like your lamp). Like light itself, the word can take a lot of different forms — it can be a noun, an adjective, or a verb, and it can mean "bright" or "not heavy". No matter how you define it, though, the word comes from the Old English word leoht.
Vocabulary lists containing light
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Space Science (Astronomy) - Introductory
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Waves and Wave Properties - Introductory
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
As the number of satellites grows, so too will light pollution from space.
From The Wall Street Journal ● Nov. 2, 2026
The light appears when a neutrino interacts with matter in the ice and produces a charged particle traveling faster than light can move through that material.
From Science Daily ● Nov. 2, 2026
“The combination of light positioning and hopes for strong earnings has not worked. We close down our positive views on hyperscalers and growth,” Kaiser said.
From MarketWatch ● Nov. 2, 2026
St Boniface and St Martin in the Wood said they will be available for people to pause for reflection or light a candle.
From BBC ● Nov. 2, 2026
And then a light shone in the distance.
From "Adventures of Don Quixote" by Argentina Palacios
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If you’ve ever found yourself driving along Highway 395, chances are good you’ve been craning your head west toward the Range of Light, staring at the formidable granite peaks of the Sierra Nevada.
From Los Angeles Times ● Oct. 29, 2026
Light can deliver energy in extremely short bursts and can be focused onto remarkably small areas, potentially allowing magnetic information to be written much faster and with less energy.
From Science Daily ● Oct. 27, 2026
Appeared in the October 27, 2026, print edition as 'A Rocker Who Saw the Light'.
From The Wall Street Journal ● Oct. 26, 2026
In Merseyside, a River of Light event was called off for the second day in a row, and Knowsley Safari Park has announced that it was closed on Sunday due to "high winds".
From BBC ● Oct. 25, 2026
She plucked a book called A Thousand Years of Light: An Arcanum History and scanned the contents, finding a chapter titled “Evil Marvellians Throughout the Ages.”
From "The Marvellers" by Dhonielle Clayton
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Oracle’s beleaguered stock finished the week higher after executives indicated a lighter borrowing load for AI going forward.
From MarketWatch ● Oct. 31, 2026
“I think people should still plan for rain for Halloween activities, but right now it looks more on the lighter side than moderate side” earlier in the evening, he said.
From Los Angeles Times ● Oct. 30, 2026
It’s also a half-pound lighter and a centimeter thinner than the standard Pro.
From The Wall Street Journal ● Oct. 28, 2026
Flight tests of this experimental new wing, which is longer and lighter to maximise aerodynamic efficiency and reduce fuel burn, are scheduled to begin this year.
From Barron's ● Oct. 28, 2026
I start walking in the opposite direction, feeling lighter than I have since before Gram died.
From "How to Disappear Completely" by Ali Standish
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Their central supermassive black holes may then have become locked in a gravitational struggle that launched the lightest black hole toward the edge of the combined galaxy.
From Science Daily ● Jul. 28, 2026
By contrast, the lightest Specs model weighs 132 grams.
From MarketWatch ● Jun. 17, 2026
It was befitting of an important office job, with only the lightest indicators of riches and omnipotence.
From Slate ● Jun. 11, 2026
On May 28, GoPro announced that its new Mission 1 line of products was available, describing the series as "the world's smallest, lightest, and most rugged 8K and 4K Open Gate cinema cameras."
From Barron's ● Jun. 11, 2026
She used her lightest pink marker for her own hair, the color of sweet and fluffy cotton candy.
From "Ivy Aberdeen’s Letter to the World" by Ashley Herring Blake
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Clarkson paid $5.45 million for the compound, which includes a Colonial-style main house, a guesthouse, a lighted tennis court, and a pool.
From MarketWatch ● Oct. 19, 2026
The chip maker’s $150 billion boost to its buyback authorization lighted a fire under its stock, tacking on $150 billion in market value Monday morning on a lousy day for tech stocks overall.
From The Wall Street Journal ● Sep. 29, 2026
What the family knows is in line with experiences of others who went through residential surveillance, including the small, windowless room lighted 24 hours a day with only a bed and a toilet.
From The Wall Street Journal ● Sep. 13, 2026
He admits he wrote to an associate choreographer asking if there was a solution — possibly making them from plastic foam — and was politely reminded that they would be lighted on fire.
From Los Angeles Times ● Aug. 19, 2026
Night had fallen, and most of its windows were dark, but the platform to which our truck drove us was lighted, and there were people waiting for us.
From "Mrs. Frisby and the Rats of NIMH" by Robert C. O'Brien
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Be it with candles or the pine sticks preferred in Sagada, lighting a flame is "inviting the presence of Christ with us, having fellowship with our departed loved ones", he said.
From Barron's ● Nov. 2, 2026
The 40th anniversary of Londonderry's Halloween festival has come to a spectacular close, with a carnival parade and fireworks display lighting up the skies over the River Foyle.
From BBC ● Oct. 31, 2026
Max Sorgenfrey was sipping a coffee at a cafe in Charleston, South Carolina, in early October when her phone began lighting up with messages.
From Salon ● Oct. 29, 2026
It is the tallest occupied office building in the city and regularly shines with decorative lighting for special occasions such as the Fourth of July, King Charles III’s birthday, and the New York Knicks championship.
From The Wall Street Journal ● Oct. 28, 2026
Since most of the work took place in early morning, I could supplement my income with a nighttime job, such as lighting lampposts.
From "The City Beautiful" by Aden Polydoros
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The host of amenities is jaw-dropping and includes a professionally lit baseball field, indoor pickleball and basketball courts, and a guesthouse.
From MarketWatch ● Nov. 2, 2026
It was dimly lit, and no one was dining inside.
From Slate ● Oct. 26, 2026
Heading into the final 20 minutes, with the match evenly poised 19-17 in Canada's favour, England winger Jess Breach's eyes lit up as she intercepted a pass from Justine Pelletier.
From BBC ● Oct. 24, 2026
Meanwhile, stroads are often poorly lit at night, Sanders added.
From The Wall Street Journal ● Oct. 18, 2026
Her face lit up and she shimmied her shoulders.
From "The Red Car to Hollywood" by Jennie Liu
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Get a wordDefinitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.