What does "defy" mean?

Defy: To provoke to combat or strife; to call out to combat; to challenge; to dare; to brave; to set at defiance; to treat with contempt; as, to defy an enemy; to defy the power of a magistrate; to defy the arguments of an opponent; to defy public opinion. I once again Defy thee to the trial of mortal fight. Milton. I defy the enemies of our constitution to show the contrary. Burke.