
1) Defrayal 2) Defrayment 3) Payment 4) Payment in advance 
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https://www.crosswordclues.com/clue/prepayment

• (n.) Payment in advance.
Found on 
http://thinkexist.com/dictionary/meaning/prepayment/

A method of paying for the cost of health care services in advance of their use. A method providing in advance for the cost of predetermined benefits for a population group, through regular periodic payments in the form of premiums, dues, or contributions, including those contributions that are made to a Health and Welfare Fund by employers on beha...
Found on 
http://www.encyclo.co.uk/local/20102

A privilege in a mortgage permitting the borrower to make payments in advance of their due date. Allows the borrower to pay the loan off sooner and save on interest. Not all mortgage agreements allow for prepayment, and some lenders will charge a fee for early repayment of debt, see Prepayment Premium.
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http://www.encyclo.co.uk/local/21398

Early payment of mortgage loans by homeowners. For investors in mortgage-backed bonds
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http://www.encyclo.co.uk/visitor-contributions.php
Pre·pay'ment  noun  Payment in advance. 
Found on 
http://www.encyclo.co.uk/webster/P/153

Is an additional principal amount in excess of the required amount paid by the mortgagor to reduce the open mortgage balance. 
Found on 
http://www.oasismanagement.com/glossary/

[
n] - payment in advance
Found on 
http://www.webdictionary.co.uk/definition.php?query=prepayment

prepayment 1. The payment of a debt obligation prior to its due date.  2. A payment made before the day it is due.
Found on 
http://www.wordinfo.info/words/index/info/view_unit/1549/3
 noun payment in advance
Found on 
https://www.encyclo.co.uk/local/20974

any amount paid to reduce the principal balance of a loan before the due date or payment in full of a mortgage. This can occur with the sale of the property, the pay off the loan in full, or a foreclosure. In each case, full payment occurs before the loan has been fully amortized.
Found on 
https://www.encyclo.co.uk/local/21674

payment of the mortgage loan before the scheduled due date; may be Subject to a prepayment penalty.
Found on 
https://www.encyclo.co.uk/local/21674

A prepayment is the sum paid for goods or services before their receipt or invoiced due date. In other words, a company has ordered and paid for goods or services but has not received anything yet.
Found on 
https://www.myaccountingcourse.com/accounting-dictionary/accounting-diction
  No exact match found.