Webster's English Dictionary

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trepidation

Cross references:
  1. fear                  
 
trep.i.da.tion \.trep-*-'da--sh*n\ n [L trepidation-, trepidatio, fr. 
   trepidatus, pp. of trepid]are to tremble, fr. trepidus agitated; akin to OE 
   thrafian to urge, push, Gk trapein to press grapes archaic  1: a tremulous 
   motion : TREMOR  2: nervous agitation : APPREHENSION