hadj n : the fifth pillar of Islam is a pilgrimage to Mecca during the month of Dhu al-Qadah; at least once in a lifetime a Muslim is expected to make a religious journey to Mecca and the Kaaba; "for a Muslim the hajj is the ultimate act of worship" [syn: {hajj}, {haj}] [also: {hadjes} (pl)] hadjes See {hadj}