Definitions from Wiktionary (intercalate)

▸ verb:  To insert an extra leap day into a calendar in order to maintain synchrony with natural phenomena.
▸ verb:  To insert an extra month into a calendar for the same purpose, such as for the Hebrew calendar.
▸ verb:  (molecular biology) To insert a substance between two or more molecules, bases, cells, or tissues.
▸ verb:  To insert anything somewhere (especially between other things), such as an affix into a word. (Compare interpolate.)

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