01 a. Inserted or introduced among others in the calendar; as, an intercalary month, day, etc.; -- now applied particularly to the odd day (Feb. …
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1.
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.(Chron.) See: Bissextile
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2.
Introduced or inserted among others; additional; supernumerary.“This intercalary line . . . is made the last of a triplet.” — Beattie.
Phrases & compounds
Intercalary day —
one on which no paroxysm of an intermittent disease occurs.