The upper (and usually smaller) part (casement) of a window, often hinged a the top / Any glazing above a main window, partition or door / A skylight. / Light from above; toplighting.

Alternative spelling of stagelight

plural of dark light

(idiomatic) When driving, to pass a traffic light before it changes to a color that prohibits passage.

plural of light industry

(Internet, derogatory) A nebulous grouping of people and ideologies, mostly active on the internet, who are largely aligned with the alt-right but reject anti-Semitism and accept Jews as part of Western society.

plural of speed of light

plural of light month

(astronomy, physics) A unit of length equal to the distance light travels in one month.

plural of light spectrum