(a.) Mutual; reciprocal; united.

accessory accompanying accordant affiliate affiliated agreeing allied assembled associate at one with attendant attending banded together bound bracketed cabalistic coacting coactive coadunate coincident collaborative collateral collected collective collectivistic collusive combined combining common communal communistic commutual concerted concomitant concordant concurrent concurring confederate confederated conjoined conjoint conjugate connected consilient conspiratorial cooperant cooperative coordinate copulate corporate correlated correlative coupled coworking enleagued federate federated fellow gathered general hand-in-glove hand-in-hand harmonious implicated in cahoots in common in league in partnership in with incorporated integrated interlinked interlocked interrelated intimate involved joined joint knotted leagued linked married matched mated meeting merged mutual of that ilk of that kind paired parallel parasitic partners with popular public reciprocal related saprophytic simultaneous social socialistic societal spliced symbiotic synchronous synergetic synergic synergistic teamed tied twin twinned undivided united uniting unseparated wed wedded yoked