(a.) Uniting in a league; forming a confederacy; federal.

accompanying accordant agreeing associate associated associative at one with blending coacting coactive coadunate coalescent coalescing coincident collaborative collective collusive combinative combinatory combined concerted concomitant concordant concurrent concurring conjoint conjunctival conjunctive connecting connectional connective consilient conspiratorial cooperant cooperative coordinate corporational coworking federal federative fusing harmonious incorporating incorporative joint meeting merging parasitic saprophytic symbiotic synchronous synergetic synergic synergistic unific unifying united uniting