intercalate
transitive verbTo insert (a day or month) in a calendar.
transitive verbTo insert, interpose, or interpolate.
In chronology, to insert in the calendar by proclamation or authority, as an extra day or month. See
Hence To insert between others; introduce interstitially; interject or interpolate, as something irregular or unrelated.
transitive verbTo insert, as a day or other portion of time, in a calendar.
transitive verbTo insert among others, as a verse in a stanza; specif. (Geol.), to introduce as a bed or stratum, between the layers of a regular series of rocks.
verbTo insert an extra, leap, day into a
To insert an extra month into a calendar for the same purpose. The Hebrew calendar has such a month.
verbTo insert a substance between two or more molecules, bases, cells, or tissues.
verbinsert (days) in a calendar