Acombination of men for an evil purpose; an agreement between two or more persons, to commit some crime in concert; particularly, a combination to commit treason, or excite sedition or insurrection against the government of a state; a plot; as a conspiracy against the life of a king; a conspiracy against the government. More than forty had made this conspiracy. Acts 23:13.

In law, an agreement between two or more persons, falsely and maliciously to indict, or procure to be indicted, an innocent person of felony.

A concurrence; a general tendency of two or more causes to one event.