1. (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.

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