'Nightfall' definitions:

Definition of 'nightfall'

(from WordNet)
noun
The time of day immediately following sunset; "he loved the twilight"; "they finished before the fall of night" [syn: twilight, dusk, gloaming, gloam, nightfall, evenfall, fall, crepuscule, crepuscle]

Definition of 'Nightfall'

From: GCIDE
  • Nightfall \Night"fall`\, n. The close of the day; the arrival of the night; the period at and just after dusk. --Swift. [1913 Webster +PJC]