- hajj, haj, hadj - 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"
--1 is a kind of pillar of Islam; pilgrimage, pilgrim's journey