Bible Dictionaries
Intercalation

Webster's Dictionary

(1):

(n.) The insertion or introduction of anything among others, as the insertion of a phrase, line, or verse in a metrical composition; specif. (Geol.), the intrusion of a bed or layer between other layers.

(2):

(n.) The insertion of a day, or other portion of time, in a calendar.

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