Definition of "intercalation" [in•ter•ca•la•tion]

• A period inserted into a calendar as in a leap year. (noun)
• The reversible insertion of a molecule between two others (noun)
• A layer introduced into a pre-existing sequence (noun)

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• "Ashur points to the late addition of this intercalated month, and makes it probable also that the intercalation is the work of astronomers standing under Assyrian authority."
• "After this series, I plan to do one called "Present day batteries" where I will focus on intercalation and then one called "Future of batteries" where conversion etc will come in."
• "“The word seems to be a Customs intercalation,” constitutional scholar Joaquin Bernas, SJ noted."