An organized rebellion, especially against an authority or government — is an uprising. If your entire math class joined together in rebellion against your teacher's unfair grading practices, you could call it an uprising.

The word uprising is most often used to describe a political revolt, often a violent insurrection against the established rule, but its original meaning was very different. In the thirteenth century, an uprising was a resurrection, or "the action of rising from the grave," and soon after that it meant "an action of rising from the bed." It wasn't until the late 1500's that it came to mean "revolt."

Definitions of uprising

n organized opposition to authority; a conflict in which one faction tries to wrest control from another

insurrection, rebellion, revolt, rising
Peasant's Revolt
a widespread rebellion in 1381 against poll taxes and other inequities that oppressed the poorer people of England; suppressed by Richard II
Indian Mutiny
discontent with British administration in India led to numerous mutinies in 1857 and 1858; the revolt was put down after several battles and sieges (notably the siege at Lucknow)
insurgence, insurgency
an organized rebellion aimed at overthrowing a constituted government through the use of subversion and armed conflict
intifada, intifadah
an uprising by Palestinian Arabs (in both the Gaza Strip and the West Bank) against Israel in the late 1980s and again in 2000
open rebellion against constituted authority (especially by seamen or soldiers against their officers)
Type of:
battle, conflict, struggle
an open clash between two opposing groups (or individuals)

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