defy

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To oppose or resist with boldness and assurance: defied the blockade by sailing straight through it.
2. v. To refuse to submit to or cooperate with: defied the court order by leaving the country.
3. v. To be unaffected by; resist or withstand: "So the plague defied all medicines” ( Daniel Defoe).
4. v. To challenge or dare (someone) to do something: She defied her accusers to prove their charges.

Century Dictionary and Cyclopedia

1. To renounce; reject; refuse; repudiate; cast off.
2. To revolt at; reject from dislike; disapprove.
3. To challenge to contest or trial with arms; dare to meet in combat.
4. To challenge to an action or procedure of any kind; dare to do something (generally with an implication of belief that it cannot be done, or that the action will fail of its purpose).
5. To dare; brave; manifest a contempt of or indifference to (opposition, attack, or hostile force); set at naught; resist successfully: as, to defy the arguments of an opponent; to defy the power of a magistrate.
6. To reject; eject; void: with out.
7. To digest.
8. To digest; be digested.
9. n. A challenge; a defiance.

Wiktionary

1. n. obsolete A challenge.
2. v. To renounce or dissolve all bonds of affiance, faith, or obligation with; to reject, refuse, or renounce.
3. v. this sense?) 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.

GNU Webster's 1913

1. v. obsolete To renounce or dissolve all bonds of affiance, faith, or obligation with; to reject, refuse, or renounce.
2. v. 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
3. n. obsolete A challenge.

WordNet 3.0

1. v. challenge.
2. v. resist or confront with resistance
3. v. elude, especially in a baffling way