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The Collaborative International Dictionary of English v.0.48 (gcide)

Barter \Bar"ter\ (b[aum]r"t[~e]r), v. i. [imp. & p. p.
{Bartered} (b[aum]r"t[~e]rd); p. pr. & vb. n. {Bartering}.]
[OE. bartren, OF. barater, bareter, to cheat, exchange, perh.
fr. Gr. pra`ttein to do, deal (well or ill), use practices or
tricks, or perh. fr. Celtic; cf. Ir. brath treachery, W.
brad. Cf. {Barrator}.]
To traffic or trade, by exchanging one commodity for another,
in distinction from a sale and purchase, in which money is
paid for the commodities transferred; to truck.
[1913 Webster]