cooperation

1 the state of having shared interests or efforts (as in social or business matters) a series of televised announcements made in cooperation with the tobacco companies warning teenagers about the hazards of smoking Synonyms affiliation, alliance, collaboration, confederation, connection, association, hookup, liaison, linkup, partnership, relation, relationship, tie-up, unionRelated Words business, dealings, interaction; exchange, interconnection, interrelation, mutualism, reciprocity, symbiosis; incorporation, integration, merger, unification; affinity, attachment, closeness, intimacy, rapport, sympathy; kinship, oneness, solidarity, togetherness, unity; colleagueship, companionship, company, fellowship; bed, cahoots, leagueNear Antonyms breakup, dissolution, disunion; division, parting, separation, severance, split; alienation, divorce, estrangementAntonyms disaffiliation, dissociation

2 the work and activity of a number of persons who individually contribute toward the efficiency of the whole everyone's cooperation will make the project go much faster Synonyms collaboration, teamwork, coordinationRelated Words collegiality, fellowship, partnership; community, mutualism, reciprocity, symbiosis; synergism, synergy; communion, cooperativeness, kinship, oneness, solidarity, togetherness, unityAntonyms noncooperation