WordReference Random House Unabridged Dictionary of American English © 2026
ter•cen•ten•ar•y  (tûr′sen ten′ə rē, tûr sen′tn er′ē; esp. Brit. tûr′sen tē′nə rē),USA pronunciation adj., n., pl. -nar•ies. 
  1. tricentennial.
Also, ter′cen•ten′ni•al. 
  • ter- + centenary 1835–45

Collins Concise English Dictionary © HarperCollins Publishers::
tercentenary /ˌtɜːsɛnˈtiːnərɪ/, tercentennial /ˌtɜːsɛnˈtɛnɪəl/ adj
  1. of or relating to a period of 300 years
  2. of or relating to a 300th anniversary or its celebration
 n ( pl -tenaries, -tennials)
  1. an anniversary of 300 years or its celebration
'tercentennial' also found in these entries (note: many are not synonyms or translations):
tercentenary - ter - tricentennial

Forum discussions with the word(s) "tercentennial" in the title:


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