Source : Webster's Revised Unabridged Dictionary (1913)

Caper \Ca"per\, v. i. [imp. & p. p. {Capered} p. pr. & vb. n.
   {capering}.] [From older capreoll to caper, cf. F. se cabrer
   to prance; all ultimately fr. L. caper, capra, goat. See
   {Capriole}.]
   To leap or jump about in a sprightly manner; to cut capers;
   to skip; to spring; to prance; to dance.

         He capers, he dances, he has eyes of youth. --Shak.