federation

The definition of a federation is the act of joining states or other groups with an agreement they will be governed under one central authority.

(noun)

An example of a federation is the United States.

See federation in Webster's New World College Dictionary

noun

the act of uniting or of forming a union of states, groups, etc. by agreement of each member to subordinate its power to that of the central authority in common affairs
an organization formed by such an act; league; specif., a federal union of states, nations, etc.

Origin: Fr fédération < ML federatio < L foederatus: see federate

See federation in American Heritage Dictionary 4

noun

The act of federating, especially a joining together of states into a league or federal union.
A league or association formed by federating, especially a government or political body established through federal union.

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