Webster's English Dictionary

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voucher

1. vouch.er \'vau.-ch*r\ n 1: an act of vouching  2a: a piece of supporting 
   evidence : PROOF  2b: a documentary record of a business transaction  2c: a 
   written affidavit or authorization 
2. voucher vt : to establish the authenticity of; esp : to certify by a 
   voucher 
3. voucher n : one that guarantees : SURETY