definition of
light

[1] #1 light n. [visible light, visible radiation] (physics) electromagnetic radiation that can produce a visual sensation; "the light was filtered through a soft glass window". wn

[2] #2 light n. [light source] any device serving as a source of illumination; "he stopped the car and turned off the lights". wn

[3] #3 light a. of comparatively little physical weight or density; "a light load"; "magnesium is a light metal--having a specific gravity of 1.74 at 20 degrees C". wn

[4] #4 light n. a particular perspective or aspect of a situation; "although he saw it in a different light, he still did not understand". wn

[5] #5 light v. [illume, illumine, light up, illuminate] make lighter or brighter; "This lamp lightens the room a bit". wn