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bicentennial

[bahy-sen-ten-ee-uh l] /ˌbaɪ sɛnˈtɛn i əl/
adjective
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:
the bicentennial return of a comet.
noun
4.
a 200th anniversary:
The United States had its bicentennial in 1976.
5.
a celebration of such an anniversary.
Also, especially British, bicentenary.
Origin of bicentennial
1880-1885
First recorded in 1880-85; bi-1 + centennial
Related forms
bicentennially, adverb
Usage note
See bi-1.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Word Origin and History for bicentennial

also bi-centennial, 1843 (adj.), 1871 (noun), American English, from bi- + centennial (q.v.). In rivalry with bicentenary (1831) which seems to have been the more common word in Britain.

Online Etymology Dictionary, © 2010 Douglas Harper
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