Source : Webster's Revised Unabridged Dictionary (1913)

Islam \Is"lam\, n. [Ar. isl[=a]m obedience to the will of God,
   submission, humbling one's self, resigning one's self to the
   divine disposal. Cf. {Moslem}.]
   1. The religion of the Mohammedans; Mohammedanism; Islamism.
      Their formula of faith is: There is no God but Allah, and
      Mohammed is his prophet.

   2. The whole body of Mohammedans, or the countries which they
      occupy.

Source : WordNet®

Islam
     n 1: 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 [syn: {Islamism}, {Muslimism}, {Muhammadanism},
           {Mohammedanism}, {Mohammadanism}]
     2: the monotheistic religion of Muslims founded in Arabia in
        the 7th century and based on the teachings of Muhammad as
        laid down in the Koran; "the term Muhammadanism is
        offensive to Muslims who believe that Allah, not Muhammad,
        founded their religion" [syn: {Islamism}, {Mohammedanism},
         {Muhammadanism}, {Muslimism}]