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intercalation

[in-tur-kuh-ley-shuh n] /ɪnˌtɜr kəˈleɪ ʃən/
noun
1.
the act of intercalating; insertion or interpolation, as in a series.
2.
something that is intercalated; interpolation.
Origin of intercalation
1570-1580
1570-80; < Latin intercalātiōn- (stem of intercalātiō). See intercalate, -ion
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for intercalation
n.

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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