The Collaborative International Dictionary of English v.0.48:

Recuperate \Re*cu"per*ate\ (-?t), v. i. [imp. & p. p.
   Recuperated (-?`t?d); p. pr. & vb. n. Recuperating.] [L.
   recuperatus, p. p. of recuperare. See Recover to get
   again.]
   To recover health; to regain strength; to convalesce.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Recuperate \Re*cu"per*ate\, v. t.
   To recover; to regain; as, to recuperate the health or
   strength.
   [1913 Webster]

WordNet (r) 3.0 (2006):

recuperate
    v 1: regain or make up for; "recuperate one's losses" [syn:
         recover, recoup, recuperate]
    2: regain a former condition after a financial loss; "We expect
       the stocks to recover to $2.90"; "The company managed to
       recuperate" [syn: recover, go back, recuperate]
    3: restore to good health or strength
    4: get over an illness or shock; "The patient is recuperating"
       [syn: recuperate, recover, convalesce] [ant:
       degenerate, deteriorate, devolve, drop]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "recuperate":
   ameliorate, brace up, come about, come round, convalesce, gain,
   gain strength, get back, get better, get well, heal, improve,
   look up, mend, perk up, pick up, pull through, rally, ransom,
   recapture, reclaim, recoup, recover, recruit, redeem, regain,
   renovate, reoccupy, replevin, replevy, repossess, restore, resume,
   retake, retrieve, revindicate, revive, sleep it off, survive,
   take back, turn the corner