tricentenary

/ ˌtraɪsɛnˈtɛnɪəl; ˌtraɪsɛnˈtiːnərɪ /

adjective

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

noun

1. an anniversary of 300 years or its celebration

Example Sentences

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

From New York Times