The Collaborative International Dictionary of English v.0.48:

Regurgitation \Re*gur`gi*ta"tion\ (-t?"sh?n), n. [Cf. F.
   r['e]gurgitation.]
   1. The act of flowing or pouring back by the orifice of
      entrance; specifically (Med.), the reversal of the natural
      direction in which the current or contents flow through a
      tube or cavity of the body. --Quain.
      [1913 Webster]

   2. The act of swallowing again; reabsorption.
      [1913 Webster]

WordNet (r) 3.0 (2006):

regurgitation
    n 1: backflow of blood through a defective heart valve
    2: recall after rote memorization; "he complained that school
       was just memorization and regurgitation"
    3: the reflex act of ejecting the contents of the stomach
       through the mouth [syn: vomit, vomiting, emesis,
       regurgitation, disgorgement, puking]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "regurgitation":
   Charybdis, Maelstrom, back stream, backflow, backwash, backwater,
   barf, countercurrent, counterflow, counterflux, disgorgement,
   doubling, duplication, echo, eddy, egesta, egestion, gagging, gulf,
   gurge, heaves, heaving, imitation, maelstrom, nausea, plagiarism,
   puke, quotation, reappearance, rebirth, recurrence, redoubling,
   reduplication, reecho, refluence, reflux, reincarnation, renewal,
   reoccurrence, repetition, reproduction, resumption, return, spew,
   swirl, twirl, vomit, vomiting, vomition, vortex, whirl,
   whirlpool