federate, federated (verb)

united under a central government

federate, federalize, federalise (verb)

enter into a league for a common purpose

"The republics federated to become the Soviet Union"

federate, federalize, federalise (verb)

unite on a federal basis or band together as a league

"The country was federated after the civil war"

federate (Verb)

To unite in a federation.

federate (Adjective)

federated, united in an alliance or federation.