Definition of intercalary
English to English adjective - 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.
source: Webster 1913 adjective satellite - having a day or month inserted to make the calendar year correspond to the solar year:
Feb. 29 is an intercalary day. A leap year is an intercalary year.
source: WordNet 3.0
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