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intercalary (adj.)

"inserted into the calendar," 1610s, from Latin intercalarius "intercalary, of an intercalary month," from intercalare "proclaim an intercalary day" (see intercalate). General sense of "interpolated" is attested from 1798.

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Definitions of intercalary from WordNet

intercalary (adj.)
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
From wordnet.princeton.edu