hajj or haj , also hadj 
(hăj)
(hăj)n. pl. hajj·esor haj·es , also hadj·es
Islam
Islam
A pilgrimage to Mecca during Dhu'l Hijja, considered obligatory for every Muslim who is capable of undertaking it at least once in his or her life.
[Arabic ḥajj, from ḥajja, to perform the annual Meccan pilgrimage; see ḥgg in the Appendix of Semitic roots.]