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tricentenary

British  
/ ˌtraɪsɛnˈtiːnərɪ /

adjective

  1. of or relating to a period of 300 years

  2. of or relating to a 300th anniversary or its celebration

"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

noun

  1. an anniversary of 300 years or its celebration

"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

Example Sentences

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Despite his vital importance to the development of opera, his tricentenary went almost unnoticed last year.

From New York Times Feb. 5, 2015

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