accompaniment accordance agreement alliance association bipartisanship cahoots co-working coaction coadjuvancy coadministration coagency cochairmanship codirectorship coincidence collaborativeness collectivism collectivity collusion combination combined effort commensalism common effort common enterprise communalism communism communitarianism community complicity concert concerted action concomitance concord concordance concourse concurrence confluence conjunction consilience conspiracy cooperation cooperativeness correspondence duet duumvirate ecumenicalism ecumenicism ecumenism esprit esprit de corps fellow feeling fellowship fifth-column activity fraternization harmony high treason joining of forces joint effort joint operation junction lese majesty mass action misprision of treason morale mutual assistance mutualism mutuality octet parasitism petty treason pooling pooling of resources pulling together quartet quintet quislingism reciprocity saprophytism sedition septet sextet simultaneity solidarity symbiosis synchronism synergism synergy team spirit teamwork treason trio triumvirate troika union united action