Толковый словарь английского языка - voucher

I. noun Etymology: Anglo-French, summons to guarantee a title, from ~, verb Date: circa 1523 an act of vouching, 2. a piece of supporting evidence ; proof, a documentary record of a business transaction, a written affidavit or authorization ; certificate, a form or check indicating a credit against future purchases or expenditures, a coupon issued by government to a parent or guardian to be used to fund a child's education in either a public or private school, II. transitive verb Date: 1609 to establish the authenticity of, to prepare a ~ for, III. noun Etymology: 1vouch + 2-er Date: 1612 one that guarantees ; surety