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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Crepuscular  \Cre*pus"cu*lar\  (-k?-l?r),  Crepusculous 
  \Cre*pus"cu*lous\  (-l?s),  a.  [Cf.  F.  cr['e]pusculaire.] 
  1.  Pertaining  to  twilight;  glimmering;  hence  imperfectly 
  clear  or  luminous. 
  This  semihistorical  and  crepuscular  period.  --Sir  G. 
  C.  Lewis. 
  2.  (Zo["o]l.)  Flying  in  the  twilight  or  evening,  or  before 
  sunrise;  --  said  certain  birds  and  insects. 
  Others  feed  only  in  the  twilight,  as  bats  and  owls, 
  and  are  called  crepuscular.  --Whewell.