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WordReference Random House Learner's Dictionary of American English © 2024bi•cen•ten•ni•al /ˌbaɪsɛnˈtɛniəl/USA pronunciation adj. [before a noun]- relating to or in honor of a 200th anniversary.
- lasting 200 years.
- occurring every 200 years.
n. [countable] - a 200th anniversary.
See -enn-. WordReference Random House Unabridged Dictionary of American English © 2024bi•cen•ten•ni•al (bī′sen ten′ē əl),USA pronunciation adj. - pertaining to or in honor of a 200th anniversary:bicentennial celebration; a bicentennial exposition.
- consisting of or lasting 200 years:a bicentennial period.
- occurring every 200 years:the bicentennial return of a comet.
n. - a 200th anniversary:The United States had its bicentennial in 1976.
- a celebration of such an anniversary.
Also,[esp. Brit.,] bicentenary. - bi-1 + centennial 1880–85
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