rebel
A person who resists an established authority, often violently.
Example
“A group of rebels defied the general's orders and split off from the main army.”
Other meanings
a citizen of the Confederate States of America, especially a Confederate soldier.
Word history
From Latin "rebellis" (waging war again; insurgent).
Where this comes from
This definition is adapted from “rebel” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.