- The pilgrimage to Mecca, performed by Mohammedans.
Meaning of 'hadj' (Princeton's WordNet)
1 . hadj
[ n]
Meaning (1): - the fifth pillar of Islam is a pilgrimage to Mecca during the month of Dhu al-Hijja; at least once in a lifetime a Muslim is expected to make a religious journey to Mecca and the Kaaba
Example in sentence:
for a Muslim the hajj is the ultimate act of worship