1. a Democratic political organization in New York City, founded in 1789 as a fraternal benevolent society (Tammany Society) and associated esp. in the late 1800s and early 1900s with corruption and abuse of power.
2. the building in which the Tammany organization had its headquarters.
[ named after Tammany (var. of TAMANEN, TAMMENUND), 17th-century Delaware Indian chief, later facetiously canonized as patron saint of U.S. ]