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.

(Judaism) Hanukkah. / (Hinduism) Divali. / (Myanmar) The Thadingyut Festival.

Alternative form of stoplight

An intense carbon arc lamp used in cinematography

(automotive, slang) Any warning light or indicator on the dashboard of a car, designed to alert the driver to problems, such as the parking brake being on or the oil being low.

plural of light bulb

An excess of artificial light, especially near urban areas, reducing visibility of stars, etc. in the night sky.