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
Conservation of Energy and Energy Transfer - Introductory
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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 Digger and the president peer out a window, a light flickers.
From Salon ● Oct. 5, 2026
The living room is the perfect place for guests to sit back and relax thanks to its cozy fireplace and large windows, which allow natural light to flood inside.
From MarketWatch ● Oct. 5, 2026
The non-invasive technique uses reflected light to create high-resolution, cross-sectional images of biological tissues, particularly the retina and optic nerve, allowing doctors to detect and monitor disease.
From Barron's ● Oct. 5, 2026
That was her life for almost 10 years, until the case came to light in February 2025, when Seo suffered a head injury.
From BBC ● Oct. 4, 2026
There’s a ray of light streaming through the window, and when it hits my eye, it feels like daggers stabbing my cornea.
From "Split the Sky" by Marie Arnold
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Saudi Aramco lowered its November official selling price for Arab Light crude to Asia by $3 a barrel to a discount of $5 to the Oman/Dubai benchmark.
From The Wall Street Journal ● Oct. 5, 2026
Some tickets were also discounted or free via the Blue Light Card and Tickets For Good platforms.
From BBC ● Oct. 4, 2026
Boateng, a 61-year-old pastor at Gospel Light church, has been preaching on commercial vehicles leaving Neoplan station since 2023.
From BBC ● Oct. 3, 2026
“Why do I feel so lonely when I have a Starlink antenna bolted to the transom of First Light and the possibility of talking to anyone whenever I like?”
From The Wall Street Journal ● Sep. 24, 2026
When the other two looked surprised, he added, “Orbs make a different sound when they're close to going out. And they flicker, very faintly. I saw it happen tonight at the Light Market.”
From "A Wish in the Dark" by Christina Soontornvat
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For example, performing 20 to 25 repetitions with a lighter weight can produce similar improvements to lifting a heavier weight ten times, provided the effort is high.
From Science Daily ● Oct. 2, 2026
"Visually, I notice that my stomach looks a little more defined and I also feel lighter and more comfortable."
From BBC ● Oct. 1, 2026
Villani noticed that the real work began again last year, when Kelce recommitted after a couple of lighter offseasons.
From The Wall Street Journal ● Sep. 30, 2026
My dad is darker than me, and because I’m lighter, it’s questioned, which I understand.
From Los Angeles Times ● Sep. 28, 2026
Nathan remembered Nali always kept a lighter at the firepit.
From "Healer of the Water Monster" by Brian Young
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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
The new PCs will be as slim as 14 millimeters thick, and the lightest will weigh less than 3 pounds.
From The Wall Street Journal ● Jun. 1, 2026
Not a single white person was around, even though some of the men and women had the lightest of brown skin tones.
From "Ophie's Ghosts" by Justina Ireland
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As the music intensifies, so does the questioning, as Fielder continues to push Holmes and Evans about what’s real and what’s being hidden from him as moodily lighted close-up shots flash.
From Los Angeles Times ● Sep. 23, 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
There is also a sizable swimming pool overlooking a fenced, lighted tennis court, as well as a serene pond with a charming bridge pathway running over it.
From MarketWatch ● Aug. 14, 2026
All of the stores were brightly lighted, but there were few people in the streets.
From "Bless Me, Ultima" by Rudolfo Anaya
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Such changes will vary in cost and might mean adding a stairlift, better lighting, handrails, nonslip surfaces, a safer bathroom or even relocating a bedroom to the main floor.
From MarketWatch ● Oct. 5, 2026
They’ve popped up in barns and on farms, in strip malls between an antique shop and an ax-throwing business and in churches, where lighting and sound for worship services is part of the curriculum.
From Salon ● Oct. 4, 2026
Cinelease, a Los Angeles lighting and grip rental company founded in 1977, has been expanding in recent months.
From Los Angeles Times ● Sep. 25, 2026
There are calls for Israel to allow higher quality shelters into the territory as well as equipment to upgrade latrines and sanitation as well as lighting.
From BBC ● Sep. 23, 2026
The meager light from the arena spilled around them, barely lighting the room enough to make out shapes.
From Anya and the Nightingale by Sofiya Pasternack
The retired electrical appliances engineer planted the device on the camera and lit a fuse.
From BBC ● Oct. 2, 2026
It’s a cliche: He lit up a room, but he really was everybody’s best friend.
From Los Angeles Times ● Oct. 1, 2026
"If you look at the images, the letters lit up like a Christmas tree," Seiler said.
From Science Daily ● Sep. 26, 2026
Shortly after Canada and America became embroiled in the worst bilateral trade war in their modern history, the secure phones of Europe’s top leaders lit up with a trans-Atlantic call.
From The Wall Street Journal ● Sep. 13, 2026
He truly did have a really nice smile, one that lit his eyes, making him appear open and trustworthy.
From "Bye Forever, I Guess" by Jodi Meadows
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Definitions 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.