noun
a person who favors the abolition of a practice or institution, especially capital punishment or (formerly) slavery
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The abolitionist movement aimed to end slavery in the United States.
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My great-great-grandfather was an abolitionist who fought for the freedom of all people.
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That abolitionist really knew how to stir things up and make a difference.
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She was an abolitionist of negativity, always striving to eliminate toxic influences from her life.