sesquicentenary
ses qui cen ten ar y |ˌseskwisenˈtenərē ˌsɛskwəsɛnˈtɛnəri | ▶noun chiefly Brit. ( pl. sesquicentenaries ) a sesquicentennial. ▶adjective of or relating to a sesquicentennial.
sesquicentenary |ˌsɛskwɪsɛnˈtiːn (ə )ri, -ˈtɛn -| ▶noun ( pl. sesquicentenaries ) the one-hundred-and-fiftieth anniversary of a significant event. ▶adjective relating to a sesquicentenary.