(ἐμβολισμός, from ἐμβάλλω to insert), intercalation; or the insertion of days, months, or years, in a cycle or period of time, in order to produce regularity. The Greeks made use of the lunar year of 354 days, and in order to adjust it to the solar year of 365 days they added a lunar month every second or third year, which additional month they called embolimatus, i.e. the inserted one. See CALENDAR.