intercalation

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in·ter·ca·la·tion

(in-ter'kă-lā'shŭn),
The process of insertion between two other entities, for example, insertion of a dye or drug between stacked bases in DNA.
References in periodicals archive ?
Our calculation depends on three assumptions: that the Spartan festival was the Karneia, that the festival fell in the 11th month after the fall equinox, and that no leap month intervened that year.
The 11-day difference is accounted for by adding a lunar leap month of about 29 days every two or three years.
The calculations have something to do with the Chinese calendar, which has leap months every three years or so.