The Collaborative International Dictionary of English v.0.48:

Recuperation \Re*cu`per*a"tion\
   (r[-e]*k[=u]`p[~e]r*[=a]"sh[u^]n), n. [L. recuperatio: cf. F.
   r['e]cup['e]ration.]
   Recovery, as of anything lost, especially of the health or
   strength.
   [1913 Webster] Recuperative

WordNet (r) 3.0 (2006):

recuperation
    n 1: gradual healing (through rest) after sickness or injury
         [syn: convalescence, recuperation, recovery]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "recuperation":
   comeback, convalescence, rally, ransom, recapture, reclaiming,
   reclamation, recoup, recoupment, recovery, redemption, regainment,
   reoccupation, replevin, replevy, repossession, restoration,
   resumption, retake, retaking, retrieval, retrieve, return,
   revindication, revival, salvage, trover