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  • light
    light
    noun
    something that makes things visible or affords illumination.
  • Light
    Light
    noun
    God regarded as a source of illuminating grace and strength
Synonyms
Trivia Time
Which color of light has the shortest wavelength?

light

1 American  
[lahyt] / laɪt /

noun

  1. something that makes things visible or affords illumination.

    All colors depend on light.

  2. Physics.

    1. 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.

    2. a similar form of radiant energy that does not affect the retina, as ultraviolet or infrared rays.

  3. the sensation produced by stimulation of the organs of sight.

  4. an illuminating agent or source, as the sun, a lamp, or a beacon.

  5. the radiance or illumination from a particular source.

    the light of a candle.

  6. the illumination from the sun; daylight.

    We awoke at the first light.

  7. daybreak or dawn.

    when light appeared in the east.

  8. daytime.

    Summer has more hours of light.

  9. a particular light or illumination in which an object seen takes on a certain appearance.

    viewing the portrait in dim light.

  10. a device for or means of igniting, as a spark, flame, or match.

    Could you give me a light?

  11. a traffic light.

    Don't cross till the light changes.

  12. the aspect in which a thing appears or is regarded.

    Try to look at the situation in a more cheerful light.

  13. the state of being visible, exposed to view, or revealed to public notice or knowledge; limelight.

    Stardom has placed her in the light.

  14. a person who is an outstanding leader, celebrity, or example; luminary.

    He became one of the leading lights of Restoration drama.

  15. Art.

    1. the effect of light falling on an object or scene as represented in a picture.

    2. one of the brightest parts of a picture.

  16. a gleam or sparkle, as in the eyes.

  17. a measure or supply of light; illumination.

    The wall cuts off our light.

  18. spiritual illumination or awareness; enlightenment.

  19. Architecture.

    1. Also called day. one compartment of a window or window sash.

    2. a window, especially a small one.

  20. mental insight; understanding.

  21. lights, the information, ideas, or mental capacities possessed.

    to act according to one's lights.

  22. a lighthouse.

  23. Archaic. the eyesight.


adjective

  • lighter,
    comparative
  • lightest
    superlative
  1. having light or illumination; bright; well-lighted.

    the lightest room in the entire house.

  2. pale, whitish, or not deep or dark in color.

    a light blue.

  3. (of coffee or tea) containing enough milk or cream to produce a light color.

verb (used with object)

lighted, lit, lighting
  1. to set burning, as a candle, lamp, fire, match, or cigarette; kindle; ignite.

  2. to turn or switch on (an electric light).

    One flick of the master switch lights all the lamps in the room.

  3. to give light to; furnish with light or illumination.

    The room is lighted by two large chandeliers.

  4. to make (an area or object) bright with or as if with light (often followed byup ).

    Hundreds of candles lighted up the ballroom.

  5. 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.

  6. to guide or conduct with a light.

    a candle to light you to bed.

verb (used without object)

lighted, lit, lighting
  1. to take fire or become kindled.

    The damp wood refused to light.

  2. to ignite a cigar, cigarette, or pipe for purposes of smoking (usually followed byup ).

    He took out a pipe and lighted up before speaking.

  3. to become illuminated when switched on.

    This table lamp won't light.

  4. to become bright, as with light or color (often followed byup ).

    The sky lights up at sunset.

  5. to brighten with animation or joy, as the face or eyes (often followed byup ).

idioms

  1. hide one's light under a bushel, to conceal or suppress one's talents or successes.

  2. in a good / bad light, under favorable (or unfavorable) circumstances.

    She worshiped him, but then she'd only seen him in a good light.

  3. see the light,

    1. to come into existence or being.

    2. to be made public.

    3. 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.

  4. bring to light, to discover or reveal.

    The excavations brought to light the remnants of an ancient civilization.

  5. in (the) light of, taking into account; because of; considering.

    It was necessary to review the decision in the light of recent developments.

  6. come to light, to be discovered or revealed.

    Some previously undiscovered letters have lately come to light.

  7. 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.

  8. shed / throw light on, to clarify; clear up.

    His deathbed confession threw light on a mystery of long standing.

light 2 American  
[lahyt] / laɪt /

adjective

  • lighter,
    comparative
  • lightest
    superlative
  1. of little weight; not heavy.

    a light load.

    Antonyms:
    heavy
  2. of little weight in proportion to bulk; of low specific gravity.

    a light metal.

  3. of less than the usual or average weight.

    light clothing.

  4. weighing less than the proper or standard amount.

    to be caught using light weights in trade.

  5. of small amount, force, intensity, etc.: a light rain;

    light trading on the stock market;

    a light rain;

    light sleep.

  6. using or applying little or slight pressure or force.

    The child petted the puppy with light, gentle strokes.

  7. not distinct; faint.

    The writing on the page had become light and hard to read.

    Synonyms:
    faded, indistinct
  8. easy to endure, deal with, or perform; not difficult or burdensome.

    light duties.

  9. not very profound or serious; amusing or entertaining.

    light reading.

  10. of little importance or consequence; trivial.

    The loss of his job was no light matter.

    Synonyms:
    inconsiderable, trifling
  11. easily digested.

    light food.

  12. low in any substance, as sugar, starch, or tars, that is considered harmful or undesirable.

    light cigarettes.

  13. (of alcoholic beverages)

    1. not heavy or strong.

      a light apéritif.

    2. (especially of beer and wine) having fewer calories and usually a lower alcohol content than the standard product.

  14. spongy or well-leavened, as cake.

  15. (of soil) containing much sand; porous or crumbly.

  16. slender or delicate in form or appearance.

    a light, graceful figure.

  17. airy or buoyant in movement.

    When she dances, she's as light as a feather.

  18. nimble or agile.

    light on one's feet.

  19. free from trouble, sorrow, or worry; carefree.

    a light heart.

    Synonyms:
    happy, cheery
  20. cheerful; merry.

    a light laugh.

  21. characterized by lack of proper seriousness; frivolous.

    light conduct.

    Synonyms:
    flighty
  22. sexually promiscuous; loose.

  23. easily swayed; changeable: volatile.

    a heart light of love;

    His is a life of a man light of purpose.

  24. slightly delirious; dizzy.

    I get light on one martini.

  25. Military. lightly armed or equipped.

    light cavalry.

  26. having little or no cargo, encumbrance, or the like; not burdened.

    a light freighter drawing little water.

  27. adapted by small weight or slight build for small loads or swift movement.

    The grocer bought a light truck for deliveries.

  28. using small-scale machinery primarily for the production of consumer goods.

    light industry.

  29. Nautical. noting any sail of light canvas set only in moderate or calm weather, as a royal, skysail, studdingsail, gaff topsail, or spinnaker.

  30. Meteorology. (of wind) having a speed up to 7 miles per hour (3 meters per second).

  31. Phonetics. (of l- sounds) resembling a front vowel in quality; clear.

    French l is lighter than English l.

  32. Prosody. (of a syllable)

    1. unstressed.

    2. short.

  33. Poker. being in debt to the pot.

    He's a dollar light.


adverb

lighter, lightest
  1. with few or no suitcases; lightly.

    to travel light.

  2. with no load or cargo hauled or carried.

    a locomotive running light to its roundhouse.

noun

  1. a light product, as a beer or cigarette.

idioms

  1. make light of, to treat as unimportant or trivial.

    They made light of our hard-won victory.

light 3 American  
[lahyt] / laɪt /

verb (used without object)

lighted, lit, lighting
  1. to get down or descend, as from a horse or a vehicle.

    As she lighted, the journalists began shouting questions at her.

  2. 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.

  3. to come by chance; happen; hit (usually followed by on orupon ).

    to light on a clue; to light on an ideal picnic spot.

  4. to fall, as a stroke, weapon, vengeance, or choice, on a place or person.

    The choice lighted upon our candidate.


verb phrase

  1. light into to make a vigorous physical or verbal attack on.

    He would light into anyone with the slightest provocation.

  2. light out to leave quickly; depart hurriedly.

    He lit out of here as fast as his legs would carry him.

Light 1 British  
/ laɪt /

noun

  1. God regarded as a source of illuminating grace and strength

  2. Quakerism short for Inner Light

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

light 2 British  
/ laɪt /

noun

  1. the medium of illumination that makes sight possible

  2. Also called: visible radiation. electromagnetic radiation that is capable of causing a visual sensation and has wavelengths from about 380 to about 780 nanometres

  3. (not in technical usage) electromagnetic radiation that has a wavelength outside this range, esp ultraviolet radiation

    ultraviolet light

  4. the sensation experienced when electromagnetic radiation within the visible spectrum falls on the retina of the eye

  5. anything that illuminates, such as a lamp or candle

  6. See traffic light

  7. a particular quality or type of light

    a good light for reading

    1. illumination from the sun during the day; daylight

    2. the time this appears; daybreak; dawn

  8. anything that allows the entrance of light, such as a window or compartment of a window

  9. the condition of being visible or known (esp in the phrases bring or come to light )

  10. an aspect or view

    he saw it in a different light

  11. mental understanding or spiritual insight

  12. a person considered to be an authority or leader

  13. brightness of countenance, esp a sparkle in the eyes

    1. the act of igniting or kindling something, such as a cigarette

    2. something that ignites or kindles, esp in a specified manner, such as a spark or flame

    3. something used for igniting or kindling, such as a match

  14. See lighthouse

    1. the effect of illumination on objects or scenes, as created in a picture

    2. an area of brightness in a picture, as opposed to shade

  15. a poetic or archaic word for eyesight

  16. the answer to a clue in a crossword

  17. in view of; taking into account; considering

  18. hope for the ending of a difficult or unpleasant situation

  19. quickly asleep or unconscious

    1. to gain sudden insight into or understanding of something

    2. to experience a religious conversion

    1. to come into being

    2. to come to public notice

  20. to clarify or supply additional information on

  21. to stand so as to obscure a person's vision

    1. (verb) to ignite something, esp a match, by friction

    2. (interjection) an exclamation of surprise

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

adjective

  1. full of light; well-lighted

  2. (of a colour) reflecting or transmitting a large amount of light Compare medium dark

    light yellow

  3. phonetics relating to or denoting an ( l ) pronounced with front vowel resonance; clear See dark

    the French "l" is much lighter than that of English

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

verb

  1. to ignite or cause to ignite

  2. (often foll by up) to illuminate or cause to illuminate

  3. to make or become cheerful or animated

  4. (tr) to guide or lead by light

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
light 3 British  
/ laɪt /

adjective

  1. not heavy; weighing relatively little

  2. having relatively low density

    magnesium is a light metal

  3. lacking sufficient weight; not agreeing with standard or official weights

  4. not great in degree, intensity, or number

    light rain

    a light eater

  5. without burdens, difficulties, or problems; easily borne or done

    a light heart

    light work

  6. graceful, agile, or deft

    light fingers

  7. not bulky or clumsy

  8. not serious or profound; entertaining

    light verse

  9. without importance or consequence; insignificant

    no light matter

  10. frivolous or capricious

  11. loose in morals

  12. dizzy or unclear

    a light head

  13. (of bread, cake, etc) spongy or well leavened

  14. easily digested

    a light meal

  15. relatively low in alcoholic content

    a light wine

  16. (of a soil) having a crumbly texture

    1. designed to carry light loads

    2. not loaded

  17. carrying light arms or equipment

    light infantry

  18. (of an industry) engaged in the production of small consumer goods using light machinery Compare heavy

  19. aeronautics (of an aircraft) having a maximum take-off weight less than 5670 kilograms (12 500 pounds)

  20. chem (of an oil fraction obtained from coal tar) having a boiling range between about 100° and 210°C

  21. (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

  22. bridge

    1. (of a bid) made on insufficient values

    2. (of a player) having failed to take sufficient tricks to make his contract

  23. phonetics prosody (of a syllable, vowel, etc) unaccented or weakly stressed; short Compare heavy See also light 1

  24. phonetics the least of three levels of stress in an utterance, in such languages as English

  25. informal lacking a sufficient quantity of (something)

  26. to treat as insignificant or trifling

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

adverb

  1. a less common word for lightly

  2. with little equipment, baggage, etc

    to travel light

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

verb

  1. (esp of birds) to settle or land after flight

  2. to get down from a horse, vehicle, etc

  3. to come upon unexpectedly

  4. to strike or fall on

    the choice lighted on me

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
light Scientific  
/ līt /
  1. 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.

  2. See also photon

  3. Electromagnetic energy of a wavelength just outside the range the human eye can detect, such as infrared light and ultraviolet light.

  4. See Note at electromagnetic radiation


light Cultural  
  1. The type of electromagnetic wave that is visible to the human eye. Visible light runs along a spectrum from the short wavelengths of violet to the longer wavelengths of red. (See photon.)


light More Idioms  

    More idioms and phrases containing light


Other Word Forms

Derived Forms

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.

Keep Reading on Vocabulary.com

Vocabulary lists containing light

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:

"For these reasons, the 70 percent storage level value must be interpreted flexibly and considered in light of the overall supply situation," the ministry spokeswoman said.

From Barron's ● Nov. 2, 2026

Buying Lumentum would expand its offerings in technology that uses light to move data between chips and servers.

From The Wall Street Journal ● Nov. 2, 2026

Scientists analyze the resulting pattern of light to estimate the neutrino's energy and reconstruct the direction from which it arrived.

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

Maybe they will but they’ll take longer to see the light of day?

From "Split the Sky" by Marie Arnold

"Light years of lead -- depending on their energy, they would go right through it."

From Science Daily ● Nov. 2, 2026

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

Appeared in the October 27, 2026, print edition as 'A Rocker Who Saw the Light'.

From The Wall Street Journal ● Oct. 26, 2026

Sunderland remain bottom of the Premier League after a goalless draw with Leeds in difficult conditions at the Stadium of Light.

From BBC ● Oct. 25, 2026

Light beams out the tip of the wand, and I remember what Dad taught me—that wands can allow Unremarkables to see the Glow.

From "The Manifestor Prophecy" by Angie Thomas

Oracle’s beleaguered stock finished the week higher after executives indicated a lighter borrowing load for AI going forward.

From MarketWatch ● Oct. 31, 2026

It was a lighter mood coming after the King's arrival on Tuesday where he delivered a speech acknowledging the pain of the slave trade, describing "the suffering of the past".

From BBC ● Oct. 28, 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

Aunt Melissa is heavier than Dad, and her hair is lighter than his, but I’m still shocked by how alike they look.

From "South of Somewhere" by Kalena Miller

As the lightest element, hydrogen has the greatest lifting capacity but is also highly explosive.

From The Wall Street Journal ● Sep. 18, 2026

Still, the new theoretical framework could give researchers a powerful way to expand future searches and use Earth's natural electromagnetic environment as a tool for probing some of the lightest possible forms of dark matter.

From Science Daily ● Sep. 6, 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

I feared the lightest touch might shatter him.

From "The City Beautiful" by Aden Polydoros

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

They lighted a set of fires and formed a circle around the stone remains of an ancient pagan church.

From The Wall Street Journal ● Oct. 16, 2026

Inside a cool, dimly lighted trailer where the quiet is broken mostly by the crackle of radio traffic, Abrin Vasquez drives a 40-ton bulldozer hundreds of yards away.

From The Wall Street Journal ● Sep. 19, 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

A woman reaches for a glass of water and her silhouette is lighted by the moon.

From "Educated" by Tara Westover

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

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

Exposed structure and lighting give the area the spare feeling of a hangar, with upper-level clerestory windows and skylights providing natural light.

From Los Angeles Times ● Oct. 27, 2026

Instead of sending police cars to the shaded areas, councils might send money to fix the lighting, support the community and repair the area itself.

From BBC ● Oct. 25, 2026

The lighting was just right, the shadows perfectly cast, the location spot-on.

From "City of the Plague God" by Sarwat Chadda

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

He returned to power via a military coup in 1952, which in some ways lit the spark for Fidel Castro’s toppling of the Cuban government at the end of the decade.

From Salon ● Nov. 1, 2026

It was dimly lit, and no one was dining inside.

From Slate ● Oct. 26, 2026

This time, it was Lisandro Martinez who lit the touchpaper before the game, criticising sporting director Jason Wilcox and the United hierarchy for failing, in his view, to recruit effectively during the summer.

From BBC ● Oct. 18, 2026

Grandma’s face lit at the idea of me having friends again.

From "Bye Forever, I Guess" by Jodi Meadows

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