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1. Dictionary

   light

   /lʌɪt/

   noun

   • 1. the natural agent that stimulates sight and makes things visible: "the light of the sun" Similar illuminationbrightnessluminescenceluminosityshininggleaminggleambrillianceradiancelustreglowingglowblazeglaredazzleincandescencephosphorescencesunlightmoonlightstarlightlamplightfirelightelectric lightgaslightray of lightshaft of lightbeam of lightrare:effulgencerefulgencelambencyfulgurationdaylightlight of daynatural lightsunlightdaylight hoursdaytimedayhours of sunlightOpposite darknessdarknessnight-time
   • ▪ a source of illumination, especially an electric lamp: "a light came on in his room" Similar lampflashlightheadlightheadlampsidelightwall lightstreet lightfloodlightlanterncandletaperbeacontorchstandard lamp
   • ▪ decorative illuminations: "Christmas lights"
   • ▪ a traffic light: "turn right at the lights"
   • ▪ the amount or quality of light in a place: "the plant requires good light"
   • ▪ the light falling on the windows of a house.
   • 2. an expression in someone's eyes indicating a particular emotion or mood: "a shrewd light entered his eyes"
   • ▪ a person's opinions, standards, and abilities: "leaving the police to do the job according to their lights" Similar talentskillabilityintelligencemental powersintellectknowledgeunderstanding
   • 3. understanding of a problem or mystery; enlightenment: "she saw light dawn on the woman's face" Similar aspectangleslantapproachinterpretationviewpointstandpointcontextpoint of viewvantage pointappearanceguisehuecomplexionunderstandingenlightenmentilluminationcomprehensioninsightawarenessknowledgeelucidationexplanationclarificationedificationOpposite ignorance
   • ▪ spiritual illumination by divine truth.
   • 4. an area of something that is brighter or paler than its surroundings: "sunshine will brighten the natural lights in your hair"
   • 5. a device used to produce a flame or spark: "he asked me for a light" Similar match(cigarette) lighterflamesparksource of fire
   • 6. a window or opening to let light in: "the bedroom has a wide bay with leaded lights"
   • ▪ a perpendicular division of a mullioned window.
   • ▪ a pane of glass forming the roof or side of a greenhouse or the top of a cold frame.
   • 7. a person eminent in a particular sphere of activity: "volunteers have been the shining lights of the community" Similar expertauthoritymasterleaderguruleading lightguiding lightluminarycelebritydignitarypublic figureworthyVIPbig namestarinformal:bigwigbig gunbig shotbig noiseceleb
   • 8. (in a crossword puzzle) a blank space to be filled by a letter. British

   verb

   • 1. provide with light or lighting; illuminate: "the room was lit by a number of small lamps"
   • ▪ switch on (an electric light): "only one of the table lamps was lit"
   • ▪ provide a light for (someone) so that they can see where they are going: "I'll light you down to the gate"
   • 2. make (something) start burning; ignite: "Allen gathered sticks and lit a fire"
   • ▪ begin to burn; be ignited: "the gas wouldn't light properly"

   adjective

   • 1. having a considerable or sufficient amount of natural light; not dark: "the bedrooms are light and airy" Similar brightfull of lightwell litwell lightedwell illuminatedsunnysunshinyundimmedbrilliantOpposite darkgloomy
   • 2. (of a colour) pale: "her eyes were light blue" Similar light-colouredlight-tonedpalepale-colouredpastelpastel-colouredwhitishfadedfaintweakbleachedfairlight-colouredblondegoldenflaxenyellowOpposite darkdarkbrunette

   Word Origin Old Englishlēoht, līht (noun and adjective), līhtan (verb), of Germanic origin; related to Dutch licht and German Licht, from an Indo-European root shared by Greek leukos ‘white’ and Latin lux ‘light’.

   Derivatives

   • 1. lightish adjective
   • 2. lightless adjective

   Scrabble Points: 9

   • L

     1

   • I

     1

   • G

     2

   • H

     4

   • T

     1

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   More definitions, origin and scrabble points

2. www.britannica.com › science › lightLight | Definition, Properties, Physics, Characteristics, Types...

   www.britannica.com › science › light

   • Cached

   Jul 19, 2024 · Light is electromagnetic radiation that can be detected by the human eye or other devices. Learn about the history, theory, and applications of light, from classical to quantum mechanics, and explore its role in the universe and life.

   • Light Rays

     Light - Reflection, Refraction, Diffraction: The basic...

   • Reflection and Refraction

     Light - Reflection, Refraction, Physics: Light rays change...

   • Quantum Theory of Light

     Light - Photons, Wavelengths, Quanta: By the end of the 19th...

   • Characteristics of Waves

     Light - Wavelength, Frequency, Amplitude: From ripples on a...

   • Thin-film Interference

     The subtle pattern of light and dark fringes seen in the...

   • Particle, Wave, Theories

     Light - Particle, Wave, Theories: With the dawn of the 17th...

   • Total Internal Reflection

     Light - Reflection, Refraction, Total Internal: One...

   • Unpolarized Light

     Light - Wave, Particle, Spectrum: The atoms on the surface...

3. Videos

   • 4:39

     youtube.com

     What Is Light?

     15 Oct 2015

     9.3M views

   • 2:49

     youtube.com

     What is Light - Physics (Simple Explanation)

     4 May 2017

     477K views

   • 4:13

     youtube.com

     Introduction to light | What is light ? Physics

     14 Apr 2021

     52.2K views

   View all

4. www.scientificamerican.com › article › light-is-howLight Is How Astronomers Read the Story of the Universe |...

   www.scientificamerican.com › article › light-is-how

   • Cached

   Jul 5, 2024 · These properties, however, define light, and they in turn tell us a lot about the objects that emit or reflect it. For light, the most fundamental property is the wavelength.

5. en.wikipedia.org › wiki › PhotonPhoton - Wikipedia

   en.wikipedia.org › wiki › Photon

   • Cached

   3 days ago · Photon - Wikipedia. A photon (from Ancient Greek φῶς, φωτός (phôs, phōtós) 'light') is an elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force.

6. www.britannica.com › science › lightLight - Reflection, Refraction, Physics | Britannica

   www.britannica.com › science › light

   • Cached

   Jul 19, 2024 · Light - Reflection, Refraction, Physics: Light rays change direction when they reflect off a surface, move from one transparent medium into another, or travel through a medium whose composition is continuously changing.

7. en.wikipedia.org › wiki › Speed_of_LightSpeed of light - Wikipedia

   en.wikipedia.org › wiki › Speed_of_Light

   • Cached

   2 days ago · (Redirected from Speed of Light) The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).

8. www.vedantu.com › question-answer › what-is-the-definition-ofWhat is the definition of light - Vedantu

   www.vedantu.com › question-answer › what-is-the-definition-of

   • Cached

   Jul 12, 2024 · Light is electromagnetic radiation which shows both the properties of waves and particles. It is the form of energy and also keeps the Earth warm. It exists in the form of tiny energy packets known as photons. Each wave consists of the wavelength or the frequency.The human eye observes each of the wavelengths as the different color.

9. en.wikipedia.org › wiki › Light-yearLight-year - Wikipedia

   en.wikipedia.org › wiki › Light-year

   • Cached

   1 day ago · As defined by the International Astronomical Union (IAU), the light-year is the product of the Julian year (365.25 days, as opposed to the 365.2425-day Gregorian year or the 365.24219-day Tropical year that both approximate) and the speed of light (299 792 458 m/s).