voucher n[Anglo-French, summoning of a person to guarantee title, from voucher to summon]
1 : a documentary record of a business transaction
2 : a written affidavit or authorization
3 : a form or check indicating a credit against future purchases or expenditures
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.