(a.) United; connected; associated.

accessory accompanying accordant agreeing amalgamated assimilated associate associated at one with attendant attending blended coacting coactive coadunate coefficient coincident collaborative collateral collective collectivistic collusive combinative combinatory combined combining common communal communistic commutual compact comprehensive concerted concomitant concordant concurrent concurring conjugate conjunct conjunctive connective consilient consolidated conspiratorial cooperant cooperative coordinate corporate correlative coupled coworking eclectic fellow fused general harmonious in common inclusive incorporated integrated joined joint meeting merged mixed mutual one paired parallel parasitic popular public reciprocal respective saprophytic shared simultaneous social socialistic societal symbiotic synchronous syncretistic syncretized synergetic synergic synergistic synthesized twin two-way united uniting