Pronunciation: /ˌsɛskwɪsɛnˈtiːn(ə)ri, -ˈtɛn-/
noun (plural sesquicentenaries)
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the one-hundred-and-fiftieth anniversary of a significant event: the year in which both celebrate their sesquicentenaries
adjective
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relating to a sesquicentenary: part of the Society’s sesquicentenary celebrations