Tricentennial is a word that refers to a milestone that occurs every 300 years. Some synonyms for the word tricentennial include tercentenary, 300th anniversary, and triennial jubilee. These synonyms are often used interchangeably with tricentennial to describe significant events or historical moments that take place every 300 years. Whether it's a national celebration, an important scientific discovery or a longstanding tradition, tricentennial and its synonyms are all useful terms that convey the same message. Whether you are writing an article about history, science, or culture, these synonyms can help you to express yourself in a clear and concise way.