The Collaborative International Dictionary of English v.0.48:

Repayment \Re*pay"ment\ (-ment), n.
   1. The act of repaying; reimbursement. --Jer. Taylor.
      [1913 Webster]

   2. The money or other thing repaid.
      [1913 Webster]

WordNet (r) 3.0 (2006):

repayment
    n 1: the act of returning money received previously [syn:
         refund, repayment]
    2: payment of a debt or obligation [syn: repayment,
       quittance]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "repayment":
   amends, atonement, balancing, commutation, compensation,
   counteraction, counterbalancing, expiation, indemnification,
   indemnity, kickback, lex talionis, making good, offsetting,
   paying back, recompense, recoupment, rectification, redress,
   refund, refundment, reimbursement, reparation, requital,
   restitution, retaliation, retribution, return, revenge,
   satisfaction, squaring, substitution