haj or hajj also hadj  (hāj)  n. pl. haj·es or hajj·es also hadj·es Islam A pilgrimage to Mecca during Dhu'l Hijja, made as an objective of the religious life of a Muslim. [Arabic ḥajj, from ḥajja, to perform the annual Meccan pilgrimage; see ḥgg in Semitic roots.] |