Etymology
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federate (v.)

1814 (implied in federated), a back-formation from federation, or else from Latin foederatus "leagued, federated, combined; having a treaty, bound by treaty," past participle of foederare "to establish by treaty," from foedus "covenant, treaty, alliance" (from PIE root *bheidh- "to trust, confide, persuade"). Related: Federating. As an adjective, by 1710.

updated on May 21, 2017

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Definitions of federate from WordNet
1
federate (v.)
enter into a league for a common purpose;
The republics federated to become the Soviet Union
Synonyms: federalize / federalise
federate (v.)
unite on a federal basis or band together as a league;
The country was federated after the civil war
Synonyms: federalize / federalise
2
federate (adj.)
united under a central government;
Synonyms: federated
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.