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tricentennial

[trahy-sen-ten-ee-uh l]
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adjective
  1. pertaining to 300 years or a period of 300 years.
  2. marking the completion of such a period: a tricentennial celebration.
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noun
  1. a 300th anniversary or its celebration.
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Also tercentenary, tercentennial.

Origin of tricentennial

First recorded in 1880–85; tri- + centennial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018