Inflected forms: pl. con·spir·a·cies 1. An agreement to perform together an illegal, wrongful, or subversive act. 2. A group of conspirators. 3.Law An agreement between two or more persons to commit a crime or accomplish a legal purpose through illegal action. 4. A joining or acting together, as if by sinister design: a conspiracy of wind and tide that devastated coastal areas.
ETYMOLOGY:
Middle English conspiracie, from Anglo-Norman, probably alteration of Old French conspiration, from Latin cnsprti, cnsprtin-, from cnsprtus, past participle of cnsprre, to conspire. See conspire.