dusk(noun, adjective, verb) adjective1. Tending to darkness or blackness; moderately dark or black; dusky. noun1. the time of day immediately following sunsetSimilar word(s): crepuscle, crepuscule, evenfall, fall, gloam, gloaming, nightfall, twilightDefinition categories: time, hour verb1. become duskDefinition categories: change, darken