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English definition of “light”

light

noun     /laɪt/
BRIGHTNESS [U] B1 the brightness that shines from the sun, from fire, or from electrical equipment, allowing you to see things: bright/dim light fluorescent/ultraviolet light a beam/ray of light Light was streaming in through the open door.LightPhysics in general
DEVICE [C] A2 a device that produces light: car lights to switch/turn the light on They must be in bed - I can't see any lights on anywhere.LightLighting and light fittings in the home
a light a flame from a match, etc used to make a cigarette start burning: Have you got a light, please?Tobacco and smokingHeaters and burnersFire and flameFire service
set light to sth mainly UK to make something start burningStarting fires
in the light of sth (also US in light of sth) If something is done or happens in the light of facts, it is done or happens because of those facts: The drug has been withdrawn in the light of new research.Causing things to happen
→ See also green light, street light, tail light, traffic lights, bring sth to light, cast/shed light on sth, come to light, light at the end of the tunnel
(Definition of light noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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