simple past tense and past participle of green-light

simple past tense and past participle of light up

A children's game in which one player stands in front of a line with their eyes closed, and the other players must approach the line sneakily without being spotted when the player at the line says "red light" and opens their eyes.

plural of Christmas light

(Australia) A light bulb. / A nearly evacuated glass globe containing ionized gas (plasma), which produces lightning-like patterns when touched.

An evacuated glass bulb containing a metal filament which is heated by electrical resistance to produce light.

To illuminate; to make clear.

(astronomy) A unit of length (abbreviation ly; equal to just under 10 trillion kilometres (10¹⁶ metres)) equal to the distance light travels in one Julian year; used to measure extremely large distances.

(chemistry) Water in its standard form of H₂O, containing two protium hydrogen atoms, as opposed to heavy water.

The amount of light falling on a given area, as measured by units such as the lumen.