Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of triennial is as below...

Triennially :: Triennially (adv.) Once in three years.

Triennial :: Triennial (n.) Something which takes place or appears once in three years.

Triennial :: Triennial (a.) Happening, coming about, or appearing once in every three years; as, triennial elections; a triennial catalogue; a triennial visitation..

Triennial :: Triennial (a.) Continuing three years; as, triennial parliaments; a triennial reign..

Trieterical :: Trieterical (a.) Kept or occurring once in three years; triennial.

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