Definitions
1.VerbTo challenge (someone) or brave (a hazard or opposition)."to defy an enemy; to defy the power of a magistrate; to defy the arguments of an opponent; to defy public opinion"
2.VerbTo refuse to obey."If you defy your teacher you may end up in detention."
3.VerbTo not conform to or follow a pattern, set of rules or expectations.
4.VerbTo renounce or dissolve all bonds of affiance, faith, or obligation with; to reject, refuse, or renounce.
5.NounA challenge.