noun
a movie or book that is the third installment in a series, following the original and its sequel
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The studio announced the production of the highly anticipated threequel in the popular film franchise.
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I can't wait to see the third movie in the series, the threequel!
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Have you heard about the new threequel coming out next summer?
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The third installment in the series served as the threequel, wrapping up the story in a satisfying way.