bicentennial


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

  1. a 200th anniversary: The United States had its bicentennial in 1976.
  2. a celebration of such an anniversary.

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.

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