- adv. occurring once in 200 years
English contemporary dictionary. 2014.
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bicentennial — bicentennially, adv. /buy sen ten ee euhl/, adj. 1. pertaining to or in honor of a 200th anniversary: bicentennial celebration; a bicentennial exposition. 2. consisting of or lasting 200 years: a bicentennial period. 3. occurring every 200 years … Universalium