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.
1626, a collective name for one of the two great Muslim sects (see Shiite). This is the proper use, but it commonly is used to mean "a Shiite." In Arabic, shi'ah is the name of the sect, shiya'iy is a member of the sect.