The noun commerce has 3 senses (first 1 from tagged texts)
1. (10) commerce, commercialism, mercantilism -- (transactions (sales and purchases) having the objective of supplying commodities (goods and services))
2. Department of Commerce, Commerce Department, Commerce, DoC -- (the United States federal department that promotes and administers domestic and foreign trade (including management of the census and the patent office); created in 1913)
3. commerce -- (social exchange, especially of opinions, attitudes, etc.)