intercalates

/IH0 N T ER0 K AH0 L EY0 T S/
verb
  1. 1

    To insert an extra leap day into a calendar in order to maintain synchrony with natural phenomena.

  2. 2

    To insert an extra month into a calendar for the same purpose. The Hebrew calendar has such a month.

  3. 3

    To insert a substance between two or more molecules, bases, cells, or tissues.

  4. 4

    To insert anything somewhere (especially between other things), such as an affix into a word. (Compare interpolate.)

Source: https://en.wiktionary.org/wiki/intercalate, https://en.wiktionary.org/wiki/intercalates