Definition: nightfall

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Source: WordNet (r) 1.7 

nightfall
     n : the time of day immediately following sunset; "he loved the
         twilight"; "they finished before the fall of night" [syn:
          twilight, dusk, gloaming, evenfall, fall]

Source: Webster's Revised Unabridged Dictionary (1913) 

Nightfall \Night"fall`\, n.
   The close of the day. --Swift.