Definition of tercentennial in US English:

tercentennial

adjective & noun

  • another term for tricentennial
    • ‘Yale University has much to be proud of, and now this distinguished university is celebrating it's tercentennial.’
    • ‘According to a senior officer of the Chief Minister's Office, the leaders have conveyed their tentative programmes to participate in the ceremonies associated with the extremely emotional tercentennial for the Sikh community.’
    • ‘Administrators said they had always hoped to secure funds from alumni to pay for tercentennial events.’

Pronunciation

tercentennial

/ˌtərsənˈtenēəl//ˌtərsənˈtɛniəl/