fed·er·a·tion /ˌfɛdəˈreʃən/
  聯邦,聯合,聯盟
  federation
  聯合會
  Fed·er·a·tion n.
  1. The act of uniting in a league; confederation.
  2. A league; a confederacy; a federal or confederated government.
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  federation
       n 1: an organization formed by merging several groups or parties
       2: a union of political organizations [syn: confederation, confederacy]
       3: the act of constituting a political unity out of a number of
          separate states or colonies or provinces so that each
          member retains the management of its internal affairs