1. the monotheistic religious system of Muslims founded in Arabia in the 7th century and based on the teachings of Muhammad as laid down in the Koran
   Islam is a complete way of life, not a Sunday religion
   the term Muhammadanism is offensive to Muslims who believe that Allah, not Muhammad, founded their religion
2. the civilization of Muslims collectively which is governed by the Muslim religion
   Islam is predominant in northern Africa, the Middle East, Pakistan, and Indonesia