Source : Webster's Revised Unabridged Dictionary (1913)

Conspire \Con*spire"\, v. i. [imp. & p. p. {Conspired}; p. pr. &
   vb. n. {Conspiring}.] [F. conspirer, L. onspirare to blow
   together, harmonize, agree, plot; con- + spirare to breathe,
   blow. See {Spirit}.]
   1. To make an agreement, esp. a secret agreement, to do some
      act, as to commit treason or a crime, or to do some
      unlawful deed; to plot together.

            They conspired against [Joseph] to slay him. --Gen.
                                                  xxxvii. 18.

            You have conspired against our royal person, Joined
            with an enemy proclaimed.             --Shak.

   2. To concur to one end; to agree.

            The press, the pulpit, and the stage Conspire to
            censure and expose our age.           --Roscommon.

   Syn: To unite; concur; complot; confederate; league.