1. nisan - Noun
2. Nisan - Proper noun
The first month of the jewish ecclesiastical year, formerly answering nearly to the month of April, now to March, of the Christian calendar. See Abib.
Source: Webster's dictionaryIf so, then Polycarp's martyrdom would have had to occur at least a month after the traditional February 23 dating since according to the Hebrew calendar the earliest time Nisan 14, the date of the Passover, can fall on in any given year is late March. Source: Internet
In 2009, for example, Nisan 15 on the Jewish calendar used by Rabbinic Judaism corresponds to April 9. On the calendars used by Karaites and Samaritans, Abib or Aviv 15 (as opposed to 'Nisan') corresponds to April 11 in 2009. Source: Internet
But both those who followed the Nisan 14 custom, and those who set Easter to the following Sunday had in common the custom of consulting their Jewish neighbors to learn when the month of Nisan would fall, and setting their festival accordingly. Source: Internet
Easter was henceforward to be a Sunday in a lunar month chosen according to Christian criteria—in effect, a Christian Nisan—not in the month of Nisan as defined by Jews. Source: Internet
Edwin Thiele has concluded that the ancient northern Kingdom of Israel counted years using the ecclesiastical new year starting on 1 Aviv (Nisan), while the southern Kingdom of Judah counted years using the civil new year starting on 1 Tishrei. Source: Internet
For a survey of the field, see the book by Kushilevitz and Nisan. Source: Internet