Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

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