Etymology
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venal (adj.)
1650s, "capable of being obtained for a price; that can be corrupted;" 1660s, "offered for sale," from French vénal, Old French venel "for sale" (of prostitutes, etc.; 12c.), from Latin venalis "for sale, to be sold; capable of being bribed," from venum (nominative *venus) "for sale," from PIE root *wes- (1) "to buy, sell" (source also of Sanskrit vasnah "purchase money," vasnam "reward," vasnayati "he bargains, haggles;" Greek onos "price paid, purchase," oneisthai "to buy"). Typically with a bad sense of "ready to sell one's services or influence for money and from sordid motives; to be bought basely or meanly."
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venality (n.)
1610s, from French vénalité or directly from Late Latin venalitatem (nominative venalitas) "capability of being bought," from Latin venalis "capable of being bought" (see venal).
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vend (v.)
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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bazaar (n.)
1580s, from Italian bazarra, ultimately from Persian bazar (Pahlavi vacar) "a market," from Old Iranian *vaha-carana "sale, traffic," from suffixed form of PIE root *wes- (1) "to buy, sell" (see venal) + PIE *kwoleno-, suffixed form of root *kwel- (1) "revolve, move round; sojourn, dwell."
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vile (adj.)
late 13c., "morally repugnant; morally flawed, corrupt, wicked; of no value; of inferior quality; disgusting, foul, ugly; degrading, humiliating; of low estate, without worldly honor or esteem," from Anglo-French ville, Old French vil "shameful, dishonorable; low-born; cheap; ugly, hideous," from Latin vilis "cheap, worthless, base, common," of uncertain origin, perhaps from PIE root *wes- (1) "to buy, sell" (see venal). Related: Vilely; vileness; vilety (early 13c.).
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*pel- (4)

Proto-Indo-European root meaning "to sell." 

It forms all or part of: bibliopole; monopolize; monopoly; oligopolistic; oligopoly.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit panate "barters, purchases;" Lithuanian pelnas "gain;" Greek pōlein "to sell;" Old Church Slavonic splenu, Russian polon "prey, booty;" Old Norse falr, Dutch veil, German feil "for sale, venal."  

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