(a.) Happening, coming about, or appearing once in every three years; as, triennial elections; a triennial catalogue; a triennial visitation.
TRIENNIAL
Meaning of TRIENNIAL in English
Webster's English dictionary. Английский словарь Webster. 2012
(a.) Happening, coming about, or appearing once in every three years; as, triennial elections; a triennial catalogue; a triennial visitation.
Webster's English dictionary. Английский словарь Webster. 2012