Conspiracies meaning : The act of two or more persons, called conspirators, working secretly to obtain some goal, usually understood with negative connotations. An agreement between two or more persons to break the law at some time in the future. A group of ravens. A group of lemurs. A situation in which different phonological or grammatical rules lead to similar or related outcomes. (by ellipsis) A conspiracy theory; a hypothesis alleging conspiracy. To conspire.