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Commerce (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.
Commerce (n.) Social intercourse; the dealings of one person or class in society with another; familiarity.
Commerce (n.) Sexual intercourse.
Commerce (n.) A round game at cards, in which the cards are subject to exchange, barter, or trade.
Commerce (v. i.) To carry on trade; to traffic.
Commerce (v. i.) To hold intercourse; to commune.