The Collaborative International Dictionary of English v.0.48:

Cavort \Ca*vort"\, v. i. [imp. & p. p. Cavorted; p. pr. & vb.
   n. Cavorting.]
   To prance ostentatiously; -- said of a horse or his rider.
   [Local slang, U. S.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

cavort
    v 1: play boisterously; "The children frolicked in the garden";
         "the gamboling lambs in the meadows"; "The toddlers romped
         in the playroom" [syn: frolic, lark, rollick,
         skylark, disport, sport, cavort, gambol, frisk,
         romp, run around, lark about]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "cavort":
   antic, bob, bounce, bound, caper, capriole, caracole, carry on,
   curvet, cut a dido, cut capers, cut up, dance, dido, disport,
   falcade, flounce, fool around, frisk, frolic, gambade, gambado,
   gambol, horse around, horseplay, jump, jump about, leap, play,
   prance, ramp, rollick, romp, roughhouse, skip, sport, trip