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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

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for a Muslim the hajj is the ultimate act of worship

/haj/, n., pl. hajjes.

the pilgrimage to Mecca, which every adult Muslim is supposed to make at least once in his or her lifetime: the fifth of the Pillars of Islam.

Also, hadj.

[1665-75; < Ar hajj pilgrimage]

hajj UK [hædʒ] US noun [countable] [singular hajj plural hajjes]

a journey to the holy city of Mecca that Muslims make as a religious duty http://www.macmillandictionary.com/med2cd/weblinks/hajj.htm

Thesaurus: journeys_hyponym islam_hyponym parts of a journey_meronym

Variant: haj

hajj or haj «haj», noun.

a pilgrimage to Mecca, required of every Muslim at least once in his life. Also, hadj.

╂[< Arabic ]

(also haj or hadj) n. the Muslim pilgrimage to Mecca that takes place in the last month of the year, and that all Muslims are expected to make at least once during their lifetime

/ˈhæʤ/ noun [singular]

: a journey to Mecca that is a religious duty for Muslims

hajj (also haj) [hædʒ] [hædʒ] noun (usually the Hajj) singular

the religious journey to Mecca that all Muslims try to make at least once in their lives

[hajj] from Arabic (al-) ḥajj ‘(the Great) Pilgrimage’.