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tercentenary

[tur-sen-ten-uh-ree, tur-sen-tn-er-ee; especially British tur-sen-tee-nuh-ree] /ˌtɜr sɛnˈtɛn ə ri, tɜrˈsɛn tnˌɛr i; especially British ˌtɜr sɛnˈti nə ri/
adjective, noun, plural tercentenaries.
Also, tercentennial.
Origin
1835-1845
1835-45; ter- + centenary

tricentennial

[trahy-sen-ten-ee-uh l] /ˌtraɪ sɛnˈtɛn i əl/
adjective
1.
pertaining to 300 years or a period of 300 years.
2.
marking the completion of such a period:
a tricentennial celebration.
noun
3.
a 300th anniversary or its celebration.
Also, tercentenary, tercentennial.
Origin
1880-85; tri- + centennial
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for tercentennial

tercentenary

/ˌtɜːsɛnˈtiːnərɪ/
adjective
1.
of or relating to a period of 300 years
2.
of or relating to a 300th anniversary or its celebration
noun (pl) -tenaries, -tennials
3.
an anniversary of 300 years or its celebration
Also called tricentennial
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for tercentennial

tercentenary

n.

1844, "pertaining to a period of 300 years," from ter- "three times" + centenary.

Online Etymology Dictionary, © 2010 Douglas Harper
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