The Collaborative International Dictionary of English v.0.48:

Satisfy \Sat"is*fy\, v. i.
   1. To give satisfaction; to afford gratification; to leave
      nothing to be desired.
      [1913 Webster]

   2. To make payment or atonement; to atone. --Milton.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Satisfy \Sat"is*fy\, v. t. [imp. & p. p. Satisfied; p. pr. &
   vb. n. Satisfying.] [OF. satisfier; L. satis enough +
   -ficare (in comp.) to make; cf. F. satisfaire, L.
   satisfacere. See Sad, a., and Fact.]
   1. In general, to fill up the measure of a want of (a person
      or a thing); hence, to grafity fully the desire of; to
      make content; to supply to the full, or so far as to give
      contentment with what is wished for.
      [1913 Webster]

            Death shall . . . with us two
            Be forced to satisfy his ravenous maw. --Milton.
      [1913 Webster]

   2. To pay to the extent of claims or deserts; to give what is
      due to; as, to satisfy a creditor.
      [1913 Webster]

   3. To answer or discharge, as a claim, debt, legal demand, or
      the like; to give compensation for; to pay off; to
      requite; as, to satisfy a claim or an execution.
      [1913 Webster]

   4. To free from doubt, suspense, or uncertainty; to give
      assurance to; to set at rest the mind of; to convince; as,
      to satisfy one's self by inquiry.
      [1913 Webster]

            The standing evidences of the truth of the gospel
            are in themselves most firm, solid, and satisfying.
                                                  --Atterbury.
      [1913 Webster]

   Syn: To satiate; sate; content; grafity; compensate. See
        Satiate.
        [1913 Webster]

WordNet (r) 3.0 (2006):

satisfy
    v 1: meet the requirements or expectations of [syn: satisfy,
         fulfill, fulfil, live up to] [ant: fall short of]
    2: make happy or satisfied [syn: satisfy, gratify] [ant:
       dissatisfy]
    3: fill or meet a want or need [syn: meet, satisfy, fill,
       fulfill, fulfil]

Moby Thesaurus II by Grady Ward, 1.0:

217 Moby Thesaurus words for "satisfy":
   abide by, achieve inner harmony, act up to, adhere to, allay,
   amortize, answer, appease, ascertain, assuage, assure, atone,
   atone for, attend to, avail, be convincing, be equal to,
   be faithful to, bear, board, bread, bring home to, bring over,
   bring round, bring to reason, carry conviction, cater to, certify,
   cinch, clear, clear off, clear up, clinch, cloy, coddle, comfort,
   compensate, comply with, conform to, content, convert, convict,
   convince, cosset, cram, decide, determine, dine, discharge,
   dismiss all doubt, do, do it, do justice to, drive home to,
   engorge, ensure, establish, expiate, favor, feast, fee, feed, fill,
   fill the bill, fill up, find out, fix, fodder, follow, forage,
   fulfill, get at, get by, give satisfaction, give way to, gladden,
   glut, go around, gorge, grass, gratify, graze, guerdon, hack it,
   heed, hold, hold by, honor, humor, indemnify, induce, indulge,
   inspire belief, insure, inveigle, jade, just do, keep,
   keep faith with, lead to believe, lift, liquidate, live down,
   live up to, look after, look to, make accounts square, make amends,
   make certain, make compensation, make good, make matters up,
   make no doubt, make no mistake, make reparation, make right,
   make sure, make sure of, make the grade, make up for, meat, meet,
   meet requirements, mess, mollycoddle, nail down, oblige, observe,
   overdose, overfeed, overfill, overgorge, oversaturate, overstuff,
   pacify, pall, pamper, pass, pass muster, pasture, pay,
   pay by installments, pay in full, pay off, pay on, pay the bill,
   pay the forfeit, pay the penalty, pay the shot, pay up, persuade,
   placate, please, prepay, propitiate, provide for, provision,
   put at ease, qualify, quench, quit, reach, reassure, recompense,
   redeem, redress, regale, regard, remit, remove all doubt,
   remunerate, render, repair, repay, resolve, respect, retire,
   reward, salary, sate, satiate, saturate, see that, see to it, sell,
   sell one on, serve, serve the purpose, set at ease, set at rest,
   settle, slake, solve, sort out, spoil, square, square accounts,
   square it, square things, stand, stand up, stretch,
   strike a balance, stuff, suffice, supersaturate, surfeit, sustain,
   take it, take up, talk over, tender, win over, wine and dine, work,
   write off, yield to