Source : Webster's Revised Unabridged Dictionary (1913)

Crepuscle \Cre*pus"cle\ (kr[-e]*p[u^]s"s'l), Crepuscule
\Cre*pus"cule\ (kr[-e]*p[u^]s"k[-u]l), n. [L. crepusculum, fr.
   creper dusky, dark: cf. F. cr['e]puscule.]
   Twilight. --Bailey.

Source : WordNet®

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