The Collaborative International Dictionary of English v.0.48:

Acquittal \Ac*quit"tal\, n.
   1. The act of acquitting; discharge from debt or obligation;
      acquittance.
      [1913 Webster]

   2. (Law) A setting free, or deliverance from the charge of an
      offense, by verdict of a jury or sentence of a court.
      --Bouvier.
      [1913 Webster]

WordNet (r) 3.0 (2006):

acquittal
    n 1: a judgment of not guilty [ant: condemnation,
         conviction, judgment of conviction, sentence]

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "acquittal":
   accordance, acquitment, acquittance, adherence, amortization,
   amortizement, binder, care, carrying out, cash, cash payment,
   clearance, compliance, condemnation, conformance, conformity,
   debt service, decision, defrayal, defrayment, deposit, disbursal,
   discharge, doling out, down payment, earnest, earnest money,
   execution, fulfillment, heed, heeding, hire purchase,
   hire purchase plan, installment, installment plan,
   interest payment, judgment, keeping, landmark decision,
   liquidation, monthly payments, never-never, observance,
   observation, paying, paying off, paying out, paying up, payment,
   payment in kind, payoff, penalty, performance, practice,
   prepayment, quarterly payments, quittance, regular payments,
   remittance, respect, retirement, satisfaction, sentence,
   settlement, sinking-fund payment, spot cash, verdict,
   weekly payments



Bouvier's Law Dictionary, Revised 6th Ed (1856):

ACQUITTAL, contracts. A release or discharge from an obligation or
engagement. According to Lord Coke there are three kinds of acquittal,
namely; 1. By deed, when the party releases the obligation; 2. By
prescription; 3. By tenure. Co. Lit. 100, a.



Bouvier's Law Dictionary, Revised 6th Ed (1856):

ACQUITTAL, crim. law practice. The absolution of a party charged with a
crime or misdemeanor.
    2. Technically speaking, acquittal is - the absolution of a party
accused on a trial before a traverse jury. 1 N. & M. 36; 3 McCord, 461.
    3. Acquittals are of two kinds, in fact and in law. The former takes
place when the jury upon trial finds a verdict of not guilty; the latter
when a man is charged merely as an accessary, and the principal has been
acquitted. 2 Inst. 384. An acquittal is a bar to any future prosecution for
the offence alleged in the first indictment.