say it: FED-ur-ayt
federate is a verb and adjective meaning "enter into a league for a common purpose". It carries 3 recorded senses.
enter into a league for a common purpose
“The republics federated to become the Soviet Union”
unite on a federal basis or band together as a league
“The country was federated after the civil war”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for federate come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.