A mutiny is a rebellion against authority, like when sailors overthrow the captain of a ship or when a class of 8th graders refuses to dissect a frog in biology class.

Mutiny comes from an old verb, mutine, which means "revolt," and a mutiny is still like a revolt. It can be a group of people, like in the famous Mutiny on the Bounty in 1789 when the crew of a British Royal Navy ship kicked the captain out so they could stay in Tahiti. (Totally worth it.) A mutiny doesn't have to be at sea or in the military; it can be to "refuse the order of the person in authority," in other words, every teacher's nightmare.

Definitions of mutiny
  1. noun
    open rebellion against constituted authority (especially by seamen or soldiers against their officers)
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    type of:
    insurrection, rebellion, revolt, rising, uprising
    organized opposition to authority; a conflict in which one faction tries to wrest control from another
  2. verb
    engage in a mutiny against an authority
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    type of:
    arise, rebel, rise, rise up
    take part in a rebellion; renounce a former allegiance
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