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The Collaborative International Dictionary
Intercalary

Intercalary \In*ter"ca*la*ry\ (?; 277), a. [L. intercalaris, intercalarius: cf. F. intercalaire. See Intercalate.]

  1. (Chron.) 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. Introduced or inserted among others; additional; supernumerary. ``Intercalary spines.''
    --Owen.

    This intercalary line . . . is made the last of a triplet.
    --Beattie.

    Intercalary day (Med.), one on which no paroxysm of an intermittent disease occurs.
    --Mayne.

Douglas Harper's Etymology Dictionary
intercalary

1610s, from Latin intercalarius, from intercalare (see intercalate).

Wiktionary
intercalary

a. 1 (of a time period) inserted between others; leap (as in leap day or leap year) 2 (context botany English) of a meristem: situated between zones of permanent tissue, thus a shoot growing at the base of a leaf, in comparison with apical growth at the tip of a root or plant.

WordNet
intercalary

adj. added or having an addition to make the calender year correspond to the solar year; "Feb. 29 is an intercalary day"; "leap year is an intercalary year"

Usage examples of "intercalary".

The intercalary month, Veadar, is introduced in embolismic years in order that Passover, the 15th day of Nisan, may be kept at its proper season, which is the full moon of the vernal equinox, or that which takes place after the sun has entered the sign Aries.

But as the moon does not complete thirty days in each month, and so there are fewer days in the lunar year than in that measured by the course of the sun, he interpolated intercalary months and so arranged them that every twentieth year the days should coincide with the same position of the sun as when they started, the whole twenty years being thus complete.

The months have twenty eight days, excepting Fallow, which has twenty nine, There is also the Day of the Turn, which serves as an intercalary unit to trim up the irregularity of the year.