Intercalʹary (Latin)

Inserted between or amongst others. Thus, an intercalary day is a day foisted in between two others, as the 29th February in leap-year. (See Calends.)

“It was the custom with Greeks to add, or, as it was termed, intercalate, a month every other year.”—Priestley: On History, xiv.

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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.