- Islam, Islamism, Muslimism, Muhammadanism, Mohammedanism, Mohammadanism - the religion of Muslims collectively which governs their civilization and way of life; the predominant religion of northern Africa, the Middle East, Pakistan and Indonesia
--1 is a kind of religion, faith
--1 has members:Shiah, Shia, Shiah Islam, the Shiites; Sunni, the Sunnites; Muslim, Moslem, Mohammedan, Muhammedan, Muhammadan, Islamist