sesquicentennialPronunciation: /ˌsɛskwɪsɛnˈtɛnɪəl/Definition of sesquicentennial adjective relating to a sesquicentenary: as the town’s sesquicentennial celebrations get under way noun a sesquicentenary: the Texas Sesquicentennial was just two years awaysesquicentennial in other Oxford dictionaries Definition of sesquicentennial in the US English dictionary
