/ ˈvaʊtʃə(r); NAmE / noun
( BrE ) a printed piece of paper that can be used instead of money to pay for sth, or that allows you to pay less than the usual price of sth :
a voucher for a free meal
a travel voucher
This discount voucher entitles you to 10% off your next purchase.
—see also luncheon voucher
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WORD ORIGIN
early 17th cent.: from vouch .