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Intercalation
Intercalation In*ter`ca*la"tion, n. [L. intercalatio: cf. F.
intercalation.]
1. (Chron.) 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.
Meaning of Intercalations from wikipedia