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Intercalation is a 13 letter word which starts with the letter I and ends with the letter N for which we found 2 definitions.

(n.) The insertion of a day or other portion of time in a calendar.
(n.) The insertion or introduction of anything among others as the insertion of a phrase line or verse in a metrical composition; specif. (Geol.) the intrusion of a bed or layer between other layers.
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