1620s, from Latin vendere "to sell, give for a bribe; praise, cry up," contraction of venumdare "offer for sale," from venum "for sale" (see venal) + dare "to give" (from PIE root *do- "to give"). Related: Vended; vending; vendible (early 14c.). Vending machine is recorded from 1889.
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Definitions of vender from WordNet
someone who promotes or exchanges goods or services for money;