Abib vs. Nissan

Abib and Nissan Definitions
Abib
The first month of the year in the Jewish calendar; Nisan.
Nissan
The seventh month of the civil year; the first month of the ecclesiastic year (in March and April)
Abib
The first month of the Jewish ecclesiastical year, corresponding nearly to our April. After the Babylonish captivity this month was called Nisan.