WordWeb Online

1. An organization formed by merging several groups or parties
    
2. A union of political organizations
   - 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

Derived forms: federations

See also: federate

Type of: constitution, establishment, formation, organisation [Brit], organization, union

Encyclopedia: Federation Federation, Action for the Republic