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intercalation

[ in-tur-kuh-ley-shuhn ]
/ ɪnˌtɜr kəˈleɪ ʃən /
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noun
the act of intercalating; insertion or interpolation, as in a series.
something that is intercalated; interpolation.
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Origin of intercalation

First recorded in 1570–80, intercalation is from the Latin word intercalātiōn- (stem of intercalātiō). See intercalate, -ion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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