[adj] joined by treaty or agreement [adj] related by common characteristics or ancestry; "allied species"; "allied studies" [adj] united in a confederacy or league
aligned, confederate, confederative, related, united
affiliate, affiliated, affinitive, agnate, akin, assembled, associate, associated, avuncular, banded together, bound, bracketed, cabalistic, closely related, cognate, collateral, collected, confederate, confederated, congeneric, congenerous, congenial, co