Pronunciation: (shē'īt),[key] —n.Islam. a member of one of the two great religious divisions of Islam that regards Ali, the son-in-law of Muhammad, as the legitimate successor of Muhammad, and disregards the three caliphs who succeeded him. Also,Shi'ite,Shiعa,Shiعah,Shi•عiPronunciation: (shē-ē', shē'ē).[key]Cf. Sunni (def. 1).