The Collaborative International Dictionary of English v.0.48:

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.
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         He capers, he dances, he has eyes of youth. --Shak.
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The Collaborative International Dictionary of English v.0.48:

Caper \Ca"per\, n.
   A frolicsome leap or spring; a skip; a jump, as in mirth or
   dancing; a prank.
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   To cut a caper, to frolic; to make a sportive spring; to
      play a prank. --Shak.
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The Collaborative International Dictionary of English v.0.48:

Caper \Ca"per\, n. [D. kaper.]
   A vessel formerly used by the Dutch, privateer. --Wright.
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The Collaborative International Dictionary of English v.0.48:

Caper \Ca"per\, n. [F. c[^a]pre, fr. L. capparis, Gr. ?; cf. Ar.
   & Per. al-kabar.]
   1. The pungent grayish green flower bud of the European and
      Oriental caper (Capparis spinosa), much used for
      pickles.
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   2. (Bot.) A plant of the genus Capparis; -- called also
      caper bush, caper tree.
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   Note: The Capparis spinosa is a low prickly shrub of the
         Mediterranean coasts, with trailing branches and
         brilliant flowers; -- cultivated in the south of Europe
         for its buds. The Capparis sodada is an almost
         leafless spiny shrub of central Africa (Soudan),
         Arabia, and southern India, with edible berries.
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   Bean caper. See Bran caper, in the Vocabulary.

   Caper sauce, a kind of sauce or catchup made of capers.
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WordNet (r) 3.0 (2006):

caper
    n 1: any of numerous plants of the genus Capparis
    2: pickled flower buds used as a pungent relish in various
       dishes and sauces
    3: a crime (especially a robbery); "the gang pulled off a bank
       job in St. Louis" [syn: caper, job]
    4: a playful leap or hop [syn: caper, capriole]
    5: gay or light-hearted recreational activity for diversion or
       amusement; "it was all done in play"; "their frolic in the
       surf threatened to become ugly" [syn: play, frolic,
       romp, gambol, caper]
    6: a ludicrous or grotesque act done for fun and amusement [syn:
       antic, joke, prank, trick, caper, put-on]
    v 1: jump about playfully