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quinquennial

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twenty-fourth

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quarter

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quadrennium

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seventy-fifth

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quarterfinal

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lower quartile

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centennial

noun 0.539

quinzaine

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last quarter

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century

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quarterly

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twenty-sixth

noun 0.527

sesquicentennial

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twenty-seventh

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twentysomething

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fortnight

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quart

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bicentennial

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quarters

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centenary

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fourth

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twenty-eighth

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quadruple

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quintuple

noun 0.500