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Definition of federation noun from the Oxford Advanced American Dictionary

      

    federation

     noun
    noun
    NAmE//ˌfɛdəˈreɪʃn//
     
     
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  1. 1[countable] a country consisting of a group of individual states that have control over their own affairs but are controlled by a central government for national decisions, etc. the Russian Federation
  2. 2 [countable] a group of clubs, labor unions, etc. that have joined together to form an organization the World Wrestling Federation
  3. 3 [uncountable] the act of forming a federation Some of the unions are against federation.
See the Oxford Advanced Learner's Dictionary entry: federation