Possible Definitions:
1. 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.
2. Commerce (n.) Social intercourse; the dealings of one person or class in society with another; familiarity.
3. Commerce (n.) Sexual intercourse.
4. Commerce (n.) A round game at cards, in which the cards are subject to exchange, barter, or trade.
5. Commerce (v. i.) To carry on trade; to traffic.
6. Commerce (v. i.) To hold intercourse; to commune.