Noun
1. a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions)
2. someone who exhibits great independence in thought and action
Verb
1. take part in a rebellion; renounce a former allegiance
2. break with established customs
Adjective
1. used by northerners of Confederate soldiers;
"the rebel yell"2. participating in organized resistance to a constituted government;
"the rebelling confederacy"