Collusion1. (n.) A secret agreement and cooperation for a fraudulent or deceitful purpose; as working in collusion against a union; a playing into each other's hands; deceit; fraud; cunning.
2. (n.) An agreement between two or more persons to defraud a person of his rights, by the forms of law, or to obtain an object forbidden by law.
Thesaurus Entries
accompaniment, accordance, agreement, alliance, artifice, association, bipartisanship, cabal, cahoots, chicane, chicanery, co-working, coaction, coadjuvancy, coadministration, coagency, cochairmanship, codirectorship, coincidence, collaboration, collaborativeness, collectivism, collectivity, combination, combined effort, commensalism, common effort, common enterprise, communalism, communism, communitarianism, community, complicity, complot, concert, concerted action, concomitance, concord, concordance, concourse, concurrence, confederacy, confluence, conjunction, connivance, connivery, consilience, conspiracy, contrivance, contriving, cooperation, cooperativeness, correspondence, counterplot, covin, deep-laid plot, dodgery, duet, duumvirate, ecumenicalism, ecumenicism, ecumenism, engineering, esprit, esprit de corps, fellow feeling, fellowship, finagling, finesse, foul play, frame-up, game, harmony, intrigue, joining of forces, joint effort, joint operation, junction, little game, machination, maneuvering, manipulation, mass action, morale, mutual assistance, mutualism, mutuality, octet, parasitism, pettifoggery, pettifogging, plot, plotting, pooling, pooling of resources, pulling together, quartet, quintet, reciprocity, rigging, saprophytism, scheme, schemery, scheming, septet, sextet, sharp practice, simultaneity, skulduggery, sleight, solidarity, stratagem, supercherie, symbiosis, synchronism, synergism, synergy, team spirit, teamwork, trick, trickery, trio, triumvirate, troika, underhand dealing, underplot, union, united action, web of intrigue, wire-pulling