A Hebrew month, nearly answering to our April, but varying somewhat from year to year, according to the course of the moon. It was the seventh month of the civil year; but was made the first month of the sacred year, at the coming out of Egypt, Exodus 12:2 . By Moses it is called Abib, Exodus 13:4 . The name Nisan found only after the time of Ezra, and the return from the captivity of Babylon. See MONTIS.
Although written in 1859 by William Rand, this dictionary of the Bible from the American Tract Society is still relevant today.Wikipedia
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