Definition of "defy"

noun:
- A challenge.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
verb:
- To renounce or dissolve all bonds of affiance, faith, or obligation with; to reject, refuse, or renounce.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
- 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.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License