TRIENNIAL


Meaning of TRIENNIAL in English

noun something which takes place or appears once in three years.

2. triennial ·adj continuing three years; as, triennial parliaments; a triennial reign.

3. triennial ·adj happening, coming about, or appearing once in every three years; as, triennial elections; a triennial catalogue; a triennial visitation.

Webster English vocab.      Английский словарь Webster.