Merriam-Webster Collegiate Dictionary - islam

 noun  Etymology: Arabic islam submission (to the will of God)  Date: 1817  1. the religious faith of Muslims including belief in Allah as the sole deity and in Muhammad as his prophet  2.  a. the civilization erected upon ~ic faith  b. the group of modern nations in which ~ is the dominant religion  • ~ic adjective  • ~ics noun plural but singular or plural in construction