1. : a board or an organization that regulates, promotes, supervises, or protects commercial or business enterprises or interests: as
a. : a committee of the English privy council formerly appointed to consider matters relating to trade and the colonies
b. : an English administrative department concerned with the government's commercial and industrial policies
c. : an organization or league of businessmen for the protection and promotion of business interests — compare chamber of commerce
2. : a commodities exchange
the Chicago Board of Trade