a. and sb. [f. BI- pref.2 4 + CENTENNIAL, f. L. *centennium (cf. biennium) space of a hundred years.] A. adj. Occurring every two hundred years; lasting two hundred years. B. sb. = BICENTENARY (and etymologically more correct than that word).
1828. Kennebec Jrnl., 3 Oct., 3/2. The bi-centennial anniversary, or the completion of two hundred years since the settlement of Salem.
1883. Harper’s Mag., Dec., 160/1. Bicentennial of German Colonisation in the United States.
