Federation - a state governed under the system of federalism.
An organisation, such as a trade union, company or NGO, with a structure analogous to that of a political federation. In French, and thereby amongst European socialists, the term is used for the former.
Identity federation - a concept in identity management referring to the decentralised storage of information related to users of one or more IT systems.
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Federalism is a system of government in which power is constitutionally divided between a central authority and constituent political units (like states or provinces).
The case for federalism is advanced by federalist theory, which argue that federalism provides a robust constitutional system that anchors pluralist democracy, and that it enhances democratic participation through providing dual citizenship in a compound republic.
Federalism is one of the three pillars of the U.S. Constitution.