| Noun | 1. | Dhu al-Hijjah - the twelfth month of the Islamic calendar and the season of the hajj; has one extra day in leap years Islamic calendar, Mohammedan calendar, Moslem calendar, Muhammadan calendar, Muslim calendar - the lunar calendar used by Muslims; dates from 622 AD (the year of the Hegira); the beginning of the Muslim year retrogresses through the solar year completing the cycle every 32 years Islamic calendar month - any lunar month in the Muslim calendar |