From BiblePortal Wikipedia
Webster's Dictionary 
(1): ( n.) The religion of the Mohammedans; Mohammedanism; Islamism. Their formula of faith is: There is no God but Allah, and Mohammed is his prophet.
(2): ( n.) The whole body of Mohammedans, or the countries which they occupy.
The Nuttall Encyclopedia 
he religion of Mahomet, "that we must submit to God; that our whole strength lies in resigned submission to Him, whatsoever He do to us, for this world and the other; this is the soul of Islam; it is properly the soul of Christianity; Christianity also commands us, before all, to be resigned to God. This is yet the highest wisdom that Heaven has revealed to our earth." See "Heroes and Hero-Worship."