To traffic or trade by exchanging one commodity for another, in distinction from buying and selling for money.To give (one thing or commodity) for another of equivalent or supposed equivalent value: with a person, for (formerly with) a thing: as, to barter one's jewels for bread.To exchange, in general.n. The act of exchanging; specifically, the act or practice of trafficking by exchange of commodities.n. The thing given in exchange.n. An arithmetical rule by which the values of different goods are ascertained and comparedn. Synonyms Dealing, trade, traffic, truck, interchange.