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Intercalation
Open directlyWebster's 1828 Dictionary · 1828
Part of speech: noun (n.)
1. The insertion of a day, or other portion of time, in a calendar.
2. 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. Intercalations of fresh-water species in some localities. Mantell.