The Collaborative International Dictionary of English v.0.48:

Quitclaim \Quit"claim`\ (kw[i^]t"kl[=a]m`), n. [Quit, a. +
   claim.] (Law)
   A release or relinquishment of a claim; a deed of release; an
   instrument by which some right, title, interest, or claim,
   which one person has, or is supposed to have, in or to an
   estate held by himself or another, is released or
   relinquished, the grantor generally covenanting only against
   persons who claim under himself.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Quitclaim \Quit"claim`\, v. t. [imp. & p. p. Quitclaimed
   (kw[i^]t"kl[=a]md`); p. pr. & vb. n. Quitclaiming.] (Law)
   To release or relinquish a claim to; to release a claim to by
   deed, without covenants of warranty against adverse and
   paramount titles.
   [1913 Webster]

WordNet (r) 3.0 (2006):

quitclaim
    n 1: document transferring title or right or claim to another
         [syn: quitclaim, quitclaim deed]
    2: act of transferring a title or right or claim to another

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "quitclaim":
   abandon, abjure, cede, deed of release, disgorge, dispense with,
   dispose of, do without, drop, dump, forgo, forswear,
   get along without, get rid of, give away, give up, have done with,
   kiss good-bye, make a sacrifice, part with, recant, relinquish,
   render up, renounce, resign, retract, sacrifice, spare, surrender,
   swear off, throw up, vacate, waive, waiver, yield