1. (n.) The exchange or buying and selling of commodities; esp. the exchange of merchandise, on a large scale, between different places or communities; extended trade or traffic.
2. (n.) Social intercourse; the dealings of one person or class in society with another; familiarity.
3. (n.) Sexual intercourse.
4. (n.) A round game at cards, in which the cards are subject to exchange, barter, or trade.