A group of countries acting together for political or economic goals, an alliance: e.g., the eastern bloc, the western bloc, a trading bloc, the Eurozone, the European Union.
A group of voters or politicians who share common goals.
An alliance.
A state where the sovereign constituent units delegate their authority to the centre. As opposed to a federation, where the central and regional governments are each equal and sovereign in their own sphere.
Specifically, an instance of a decentralized governing structure among the indigenous peoples of North America.