fed·er·ate /ˈfɛd(ə)rət/
  (a.)同盟的,聯合的,聯邦制度下的(vt.)(vi.)公布聯邦制,(使)聯合,同盟
  Fed·er·ate a.  United by compact, as sovereignties, states, or nations; joined in confederacy; leagued; confederate; as, federate nations.
  Syn: -- federated.
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  federate
       adj : united under a central government [syn: federated]
       v 1: enter into a league for a common purpose; "The republics
            federated to become the Soviet Union" [syn: federalize,
             federalise]
       2: unite on a federal basis or band together as a league; "The
          country was federated after the civil war" [syn: federalize,
           federalise]