Source : Webster's Revised Unabridged Dictionary (1913)

Intrigue \In*trigue"\ ([i^]n*tr[=e]g"), v. i. [imp. & p. p.
   {Intrigued} (-tr[=e]gd"); p. pr. & vb. n. {Intriguing}.] [F.
   intriguer, OF. intriquer, entriquer; cf. It. intrigare. See
   {Intricate}, {Extricate}.]
   1. To form a plot or scheme; to contrive to accomplish a
      purpose by secret artifice.

   2. To carry on a secret and illicit love or amour.

Intrigue \In*trigue"\, v. t.
   To fill with artifice and duplicity; to complicate; to
   embarrass. [Obs.]

         How doth it [sin] perplex and intrique the whole course
         of your lives!                           --Dr. J.
                                                  Scott.

Intrigue \In*trigue"\, n. [Cf. F. intrique. See {Intrigue}, v.
   i.]
   1. Intricacy; complication. [Obs.] --Sir M. Hale.

   2. A complicated plot or scheme intended to effect some
      purpose by secret artifice; conspiracy; stratagem.

            Busy meddlers with intrigues of state. --Pomfret.

   3. The plot or romance; a complicated scheme of designs,
      actions, and events. --Pope.

   4. A secret and illicit love affair between two persons of
      different sexes; an amour; a liaison.

            The hero of a comedy is represented victorious in
            all his intrigues.                    --Swift.

   Syn: Plot; scheme; conspiracy; machination.

Source : WordNet®

intrigue
     n 1: a crafty and involved plot to achieve your (usually
          sinister) ends [syn: {machination}]
     2: a clandestine love affair

intrigue
     v 1: cause to be interested or curious [syn: {fascinate}]
     2: form intrigues (for) in an underhand manner [syn: {scheme},
        {connive}]