rebel

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To refuse allegiance to and oppose by force an established government or ruling authority.
2. v. To resist or defy an authority or a generally accepted convention.
3. v. To feel or express strong unwillingness or repugnance: She rebelled at the unwelcome suggestion.
4. n. One who rebels or is in rebellion: "He is the perfect recruit for fascist movements: a rebel not a revolutionary, contemptuous yet envious of the rich and involved with them” ( Stanley Hoffman).
5. n. A Confederate soldier.

Century Dictionary and Cyclopedia

1. Resisting authority or law; rebellious.
2. Of a rebellious nature or character; characteristic of a rebel.
3. n. A person who makes war upon the government of his country from political motives; one of a body of persons organized for a change of government or of laws by force of arms, or by open defiance.
4. n. Hence One who or that which resists authority or law; one who refuses obedience to a superior, or who revolts against some controlling power or principle.
5. n. Synonyms Traitor, etc. See insurgent, n.
6. To make war against one's government, or against anything deemed oppressive, by arms or other means; revolt by active resistance or repulsion.

Wiktionary

1. n. A person who resists an established authority, often violently.
2. v. intransitive To resist or become defiant toward an authority.

GNU Webster's 1913

1. adj. Pertaining to rebels or rebellion; acting in revolt; rebellious.
2. n. One who rebels.
3. v. To renounce, and resist by force, the authority of the ruler or government to which one owes obedience. See rebellion.
4. v. To be disobedient to authority; to assume a hostile or insubordinate attitude; to revolt.

WordNet 3.0

1. n. a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions)
2. v. break with established customs
3. n. someone who exhibits great independence in thought and action
4. n. `Johnny' was applied as a nickname for Confederate soldiers by the Federal soldiers in the American Civil War; `greyback' derived from their grey Confederate uniforms
5. v. take part in a rebellion; renounce a former allegiance