"Triennial" is a word in ENGLISH

triennial ENGLISH
Definition:

Something which takes place or appears once in three
years.

triennial ENGLISH
Definition:

Continuing three years; as, triennial parliaments; a
triennial reign.

triennial ENGLISH
Definition:

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

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Triennial Act LAW AND LEGAL

An Engllsh statute limtting the duratlon of every parliament to three years, uifless sooner dissolved. It was passed by the …

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triennially ENGLISH

Once in three years.

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trieterical ENGLISH

Kept or occurring once in three years; triennial.

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