Source : Webster's Revised Unabridged Dictionary (1913)

Mohammedan year \Mohammedan year\
   The year used by Mohammedans, consisting of twelve lunar
   months without intercalation, so that they retrograde through
   all the seasons in about 321/2 years. The Mohammedan era
   begins with the year 622 {a}.{d}., the first day of the
   Mohammedan year 1332 begin Nov. 30, 1913, acording to the
   Gregorian calendar.