noun
a one-hundred-and-fiftieth anniversary
adjective
relating to a one-hundred-and-fiftieth anniversary
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The city celebrated its sesquicentennial with a grand parade and fireworks display.
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We're throwing a big party for the town's sesquicentennial next month.
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The sesquicentennial bash is gonna be lit!
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Reaching the sesquicentennial milestone feels like a significant achievement for the community.