intercalation

intercalation

[in-tur-kuh-ley-shuhn]
noun
1.
the act of intercalating; insertion or interpolation, as in a series.
2.
something that is intercalated; interpolation.

Origin:
1570–80; < Latin intercalātiōn- (stem of intercalātiō). See intercalate, -ion

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World English Dictionary
intercalate (ɪnˈtɜːkəˌleɪt)
 
vb
1.  to insert (one or more days) into the calendar
2.  to interpolate or insert
 
[C17: from Latin intercalāre to insert, proclaim that a day has been inserted, from inter- + calāre to proclaim]
 
interca'lation
 
n
 
in'tercalative
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

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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