federate

to form or enter into an association that furthers the interests of its members <in the years following World War II, the U.S. and the nations of western Europe made the decision to federate as the North Atlantic Treaty Organization> Synonyms associate, band (together), club, coalesce, cohere, confederate, conjoin, cooperate, ally, league, uniteRelated Words cabal, collaborate, gang up, hang together, team (up); incorporate, organize, unionize; affiliate; amalgamate, combine, conglomerate, consolidate, converge, group, join, merge; knot, link, tie, wedNear Antonyms detach, disengage, dissolve, disunite, divorce, part, segregate, separate, sever, split, sunder; alienate, estrange, fall outAntonyms break up, disband