"federate" in the verb sense
1. federate, federalize, federalise
enter into a league for a common purpose
"The republics federated to become the Soviet Union"
2. federate, federalize, federalise
unite on a federal basis or band together as a league
"The country was federated after the civil war"
"federate" in the adjective sense
1. federate, federated
united under a central government
Source: WordNet® (An amazing lexical database of English)
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