Bible Dictionaries
Intercalary

Webster's Dictionary

(1):

(a.) Inserted or introduced among others in the calendar; as, an intercalary month, day, etc.; - now applied particularly to the odd day (Feb. 29) inserted in the calendar of leap year. See Bissextile, n.

(2):

(n.) Introduced or inserted among others; additional; supernumerary.

Bibliography Information
Webster, Noah. Entry for 'Intercalary'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​i/intercalary.html. 1828.