Definitions
1.NounLight shining from a source behind the object of interest or attention."The backlight from the sunset cast the pier and the crowd in silhouette.; Egg candling uses backlight to look for chick embryos."
2.NounA spotlight that illuminates a photographic subject from behind.
3.NounLight that is behind a photographic subject.
4.NounA light attached to an LCD display.
5.NounThe rear window of a motor car.
6.VerbTo illuminate something from behind.