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refund1

[verb ri-fuhnd, ree-fuhnd; noun ree-fuhnd]
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verb (used with object)
  1. to give back or restore (especially money); repay.
  2. to make repayment to; reimburse.
verb (used without object)
  1. to make repayment.
noun
  1. an act or instance of refunding.
  2. an amount refunded.

Origin of refund1

1350–1400; Middle English refunden (v.) < Latin refundere to pour back, equivalent to re- re- + fundere to pour; see found3
Related formsre·fund·a·ble, adjectivere·fund·a·bil·i·ty, nounre·fund·er, nounre·fund·ment, nounnon·re·fund·a·bil·i·ty, nounnon·re·fund·a·ble, adjectiveun·re·fund·a·ble, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for unrefundable

refund

verb (rɪˈfʌnd) (tr)
  1. to give back (money), as when an article purchased is unsatisfactory
  2. to reimburse (a person)
noun (ˈriːˌfʌnd)
  1. return of money to a purchaser or the amount so returned
Derived Formsrefundable, adjectiverefunder, noun

Word Origin

C14: from Latin refundere to pour back, from re- + fundere to pour
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unrefundable

refund

v.

"to give back, restore," early 15c. (earlier "to pour back," late 14c.), from Old French refunder "restore" and directly from Latin refundere "give back, restore, return," literally "pour back, flow back," from re- "back" (see re-) + fundere "to pour" (see found (v.2)). Specifically of money from 1550s. Related: Refunded; refunding.

refund

n.

"a return of money paid," 1782, from refund (v.).

Online Etymology Dictionary, © 2010 Douglas Harper