A rebellion was when the oppressed rose up against their oppressors.
Following the repulsion of the 2150s Dalek invasion of Earth, other subjugated races began their own rebellions against the Dalek Empire. (PROSE: Dalek: The Astounding Untold History of the Greatest Enemies of the Universe)
During Operation Human Factor, the Second Doctor mocked the Dalek Emperor that a rebellion would occur on Skaro, as the Daleks implanted with the Human factor would question Dalek uniformity and convince their fellows to do so. (TV: The Evil of the Daleks)
The Daleks identified the Combined Galactic Resistance as rebels. (TV: Into the Dalek)