[1] : The Collaborative International Dictionary of English v.0.48

nisan \ni"san\, n. heb. nimacs=an.
   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.
   1913 webster
see also:
abib 

[2] : The Collaborative International Dictionary of English v.0.48

abib \a"bib\, n. heb. abimacb, lit. an ear of corn. the month
   was so called from barley being at that time in ear.
   the first month of the jewish ecclesiastical year,
   corresponding nearly to our april. after the babylonish
   captivity this month was called nisan. --kitto.
   1913 webster
see also:
nisan 

[3] : WordNet (r) 2.0

nisan
     n : the seventh month of the civil year; the first month of the
         ecclesiastic year in march and april syn: nissan
see also:
nissan 

[4] : Easton's 1897 Bible Dictionary

nisan
   month of flowers, neh. 2:1 the first month of the jewish
   sacred year. see abib. assyrian nisannu,
   "beginning."
   
see also:
abib 

[5] : Hitchcock's Bible Names Dictionary (late 1800's)

nisan, standard; miracle

Nisan >> N Words
Nisan, definition of term: Nisan
nisan_pag1.html