Word:

light speed

Noun1.light speed - the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second
Synonyms: speed of light, c
c, constant, speed, speed of light, velocity
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light minute
Light money
Light of foot
Light of heart
Light oil
light opera
light pen
light pipe
Light purse
light reaction
light reflex
Light sails
light second
light show
Light sleeper
light source
-- light speed --
light time
light touch
light unit
light up
light upon
Light weight
light welterweight
light whipping cream
Light Within
light year
Light-armed
light-blue
Light-boat
light-colored
light-coloured
light-duty
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