Bible Dictionaries
Triennial

Webster's Dictionary

(1):

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

(2):

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

(3):

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

Bibliography Information
Webster, Noah. Entry for 'Triennial'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/triennial.html. 1828.