01 n. The insertion of a day, or other portion of time, in a calendar.
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1.
The insertion of a day, or other portion of time, in a calendar.(Chron.)
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2.
The insertion or introduction of anything among others, as the insertion of a phrase, line, or verse in a metrical composition;(Geol.)“Intercalations of fresh-water species in some localities.” — Mantell.