WordReference Random House Learner's Dictionary of American English © 2017
bi•cen•ten•ar•y /ˌbaɪsɛnˈtɛnəri, baɪˈsɛntənˌɛri/USA pronunciation   adj., n., pl.  -ar•ies. 
  1. bicentennial.

WordReference Random House Unabridged Dictionary of American English © 2017
bi•cen•ten•ar•y  (bī′ sen tenə rē, bī sentn er′ē; esp. Brit. bī′sen tēnə rē),USA pronunciation adj., n., pl.  -ar•ies. [Chiefly Brit.]
  1. British Termsbicentennial.
  • bi-1 + centenary 1860–65

WordReference Random House Learner's Dictionary of American English © 2017
bi•cen•ten•ni•al /ˌbaɪsɛnˈtɛniəl/USA pronunciation   adj. [before a noun]
  1. relating to or in honor of a 200th anniversary.
  2. lasting 200 years.
  3. occurring every 200 years.

n. [countable]
  1. a 200th anniversary.
See -enn-.
WordReference Random House Unabridged Dictionary of American English © 2017
bi•cen•ten•ni•al  (bī′sen tenē əl),USA pronunciation 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:the bicentennial return of a comet.

n. 
  1. a 200th anniversary:The United States had its bicentennial in 1976.
  2. a celebration of such an anniversary.
Also,[esp. Brit.,] bicentenary.  bi′cen•tenni•al•ly, adv. 
  • bi-1 + centennial 1880–85
    See  bi- 1.


Collins Concise English Dictionary © HarperCollins Publishers::

bicentenary /ˌbaɪsɛnˈtiːnərɪ/, US bicentennial /ˌbaɪsɛnˈtɛnɪəl/ adj
  1. marking a 200th anniversary
  2. occurring every 200 years
  3. lasting 200 years
n ( pl -naries)
  1. a 200th anniversary



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