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English definition of “federation”

federation

noun uk   /ˌfed.ərˈeɪ.ʃən/ us    /-əˈreɪ-/
C1 [C] a group of organizations, countries, regions, etc. that have joined together to form a larger organization or government: The United States is a federation of 50 individual states. [U] the act of forming a federation: The federation of the six original Australian states took place in 1901. He's against European federation.
(Definition of federation from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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