(of a country or organization) set up as a single centralized unit within which each state or division keeps some internal autonomy
under the terms of the 1569 Act of the Union of Lublin, the Kingdom of Poland and the Grand Duchy of Lithuania formed a single, federated state
(with reference to a number of states or organizations) form or be formed into a single centralized unit, within which each state or organization keeps some internal autonomy
in 1901 the six colonies federated to form the Commonwealth of Australia
he resisted British attempts to federate Barbados with neighbouring islands