The Collaborative International Dictionary of English v.0.48:

Reimbursement \Re`im*burse"ment\ (-b?rs"ment), n. [Cf. F.
   rembursement.]
   The act reimbursing. --A. Hamilton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

reimbursement
    n 1: compensation paid (to someone) for damages or losses or
         money already spent etc.; "he received reimbursement for
         his travel expenses"

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "reimbursement":
   amends, atonement, compensation, indemnification, kickback,
   making good, paying back, recompense, recoupment, redress, refund,
   refundment, reparation, repayment, requital, restitution,
   retribution, return, satisfaction, squaring