tricentennial

[ trahy-sen-ten-ee-uhl ]

adjective

1. pertaining to 300 years or a period of 300 years.
2. marking the completion of such a period:

   a tricentennial celebration.

noun

1. a 300th anniversary or its celebration.

Word History and Origins

Origin of tricentennial¹

First recorded in 1880–85; tri- + centennial