What does "intrigue" mean?

Additional senses

1. 2.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.
2. 3.Intricacy; complication. [Obs.] Sir M. Hale.
3. 4.A complicated plot or scheme intended to effect some purpose by secret artifice; conspiracy; stratagem. Busy meddlers with intrigues of state. Pomfret.
4. 5.The plot or romance; a complicated scheme of designs, actions, and events. Pope.
5. 6.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.