rebel

Etymology 1

From Middle English rebel, rebell, from Old French rebelle, from Latin rebellis (“waging war again; insurgent”), from rebellō (“I wage war again, fight back”), from re- (“again, back”) + bellō (“I wage war”).

noun

1. A person who resists an established authority, often violently.
   A group of rebels defied the general's orders and split off from the main army.
   My little sister is such a rebel - coming home late, piercing her ears, and refusing to do any of her chores.
2. (US, historical) Synonym of Confederate: a citizen of the Confederate States of America, especially a Confederate soldier.

Etymology 2

From Middle English rebellen, from Old French rebeller, from Latin rebellō (“I wage war again, fight back”), from re- (“again, back”) + bellō (“I wage war”). Doublet of revel.

verb

1. (intransitive) To resist or become defiant toward an authority.
   to rebel against the system
   "Tedd's feeling a bit rebellious." "I'm not rebelling! I'm self actualizing! By rebelling." 17 April 2014, Dan Shive, El Goonish Shive (webcomic), Comic for Thursday, Apr 17, 2014