The Collaborative International Dictionary of English v.0.48:

Defrayment \De*fray"ment\, n.
   Payment of charges.
   [1913 Webster]

WordNet (r) 3.0 (2006):

defrayment
    n 1: the act of paying money [syn: payment, defrayal,
         defrayment] [ant: evasion, nonpayment]

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "defrayment":
   acquitment, acquittal, acquittance, amortization, amortizement,
   binder, cash, cash payment, clearance, debt service, defrayal,
   deposit, disbursal, discharge, doling out, down payment, earnest,
   earnest money, hire purchase, hire purchase plan, installment,
   installment plan, interest payment, liquidation, monthly payments,
   never-never, paying, paying off, paying out, paying up, payment,
   payment in kind, payoff, prepayment, quarterly payments, quittance,
   regular payments, remittance, retirement, satisfaction, settlement,
   sinking-fund payment, spot cash, weekly payments