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Definition of “light” - Learner’s Dictionary

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If something is done or happens in the light of facts, it is done or happens because of those facts: The drug has been withdrawn in the light of new research.Causing things to happen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 Learners Dictionary © Cambridge University Press)
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