From Longman Dictionary of Contemporary EnglishIslamIs‧lam /ˈɪslɑːm, ˈɪz-, ɪsˈlɑːm/ noun [uncountable] 1 RRIthe Muslim religion, which was started by Muhammad and whose holy book is the Quran (Koran)2 RRISANthe people and countries that follow this religion —Islamic /ɪzˈlæmɪk, ɪs-/ adjectiveOrigin Islam (1600-1700) Arabic islam “obeying (the will of God)”