backlight Syllabification: (back·light)Pronunciation: /ˈbakˌlīt/Definition of backlight noun illumination from behind. verb (past backlit; past participle backlit or backlighted) [with object] illuminate from behind:she was backlit by the morning sun (as adjective backlit)a backlit LCD screenDerivatives backlighting noun backlight in other Oxford dictionaries Definition of backlight in the British & World English dictionary