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[in-tur-kuh-ley-shuh n] /ɪnˌtɜr kəˈleɪ ʃən/
the act of intercalating; insertion or interpolation, as in a series.
something that is intercalated; interpolation.
1570-80; < Latin intercalātiōn- (stem of intercalātiō). See intercalate, -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for intercalation

1570s, from Latin intercalationem (nominative intercalatio) "insertion of an intercalary day," noun of action from past participle stem of intercalare (see intercalate).

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for intercalation

insertion of days or months into a calendar to bring it into line with the solar year (year of the seasons). One example is the periodic inclusion of leap-year day (February 29) in the Gregorian calendar now in general use. To keep the months of a lunar calendar (e.g., the Hindu calendar) in their proper seasons, an entire month must be intercalated periodically, because there are a fractional number (between 12 and 13) of cycles of lunar phases (months) in a solar year. In cultures without highly developed astronomy, intercalation was done empirically, whenever seasons and their properly associated months became noticeably out of step.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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