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.
Benefits resulting from combining different groups, people, objects or processes.
The cooperation of two or more nerves, muscles, organs, etc.
A synonym of binding energy.
The combined action of two or more drugs where the effects are stronger than their mere sum.