1. (n.) The act of cooperating, or of operating together to one end; joint operation; concurrent effort or labor.

2. (n.) The association of a number of persons for their benefit.

accompaniment accord accordance advocacy affiliation affinity agreement aid alliance alternation assent assistance association auspices backing backup battledore and shuttlecock blessing cahoots chorus co-working coaction coherence coincidence collaboration collective farm collectivism collectivity collegiality collusion combination combined effort common ownership communal effort communion communism community commutation companionship company compatibility complementary distribution concert concerted action concomitance concord concordance concourse concurrence confluence conformance conformation conformity congeniality congruence congruency congruity conjunction consilience consistency consociation consonance consort conspiracy cooperative society correspondence counterchange cross fire democracy engagement equivalence exchange favor fellowship fraternity fraternization friendship give-and-take harmony help helping hand interaction interchange intercommunication intercourse interlacing intermeshing intermutation interplay intersection intertwining interweaving interworking junction kibbutz kolkhoz lex talionis measure for measure membership mesh meshing mutual admiration mutual support mutual transfer mutuality oneness overlap parallelism parasitism partaking participation patronage peace permutation profit sharing public ownership quid pro quo rapport reciprocality reciprocation reciprocity retaliation saprophytism seesaw self-consistency sharecropping sharing simultaneity socialism society something for something sponsorship state ownership support symbiosis symmetry sync synchronism synergism synergy tally teamwork timing tit for tat town meeting transposal transposition uniformity union unison unisonance united action