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Webster's English Dictionary
trienniala.[L. triennium the space of three years; tri- (see Tri-) + annus year. See Annual.]1. Continuing three years; as, triennial parliaments; a triennial reign.(Howell.)2. Happening, coming about, or appearing once in every three years; as, triennial elections; a triennial catalogue; a triennial visitation.(T. Warton.)n. Something which takes place or appears once in three years.()