Princeton's WordNet

1. Islam, Muslimism(noun)

   the civilization of Muslims collectively which is governed by the Muslim religion

   "Islam is predominant in northern Africa, the Middle East, Pakistan, and Indonesia"

2. Islam, Islamism, Mohammedanism, Muhammadanism, Muslimism(noun)

   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"

Kernerman English Learner's Dictionary

1. Islam(noun)ɪsˈlɑm, -ˈlæm, ɪz-, ˈɪs ləm, ˈɪz-

   ***a religion based on the teaching of Mohammed

Wiktionary

1. Islam(Noun)

   An Abrahamic and monotheistic religion that originated with the teachings of the Prophet Muhammad; its followers are Muslim.

Origin: اسلام. The root is the same as that of سلام.

Webster Dictionary

1. Islam(noun)

   the religion of the Mohammedans; Mohammedanism; Islamism. Their formula of faith is: There is no God but Allah, and Mohammed is his prophet

2. Islam(noun)

   the whole body of Mohammedans, or the countries which they occupy

The Nuttall Encyclopedia

1. Islam

   or Islamism, the 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."

U.S. National Library of Medicine

1. Islam

   A monotheistic religion promulgated by the Prophet Mohammed with Allah as the deity.

• IslamAfrikaans
• إسْلامArabic
• ислямBulgarian
• IslãPortuguese (BR)
• islámCzech
• der IslamGerman
• islamDanish
• ισλαμισμόςGreek
• IslamSpanish
• islamEstonian
• اسلامFarsi
• islamFinnish
• IslamFrench
• אִיסלָםHebrew
• इस्लामHindi
• islamCroatian
• iszlámHungarian
• IslamIndonesian
• íslam, múhameðstrúIcelandic
• IslamItalian
• イスラム教Japanese
• 이슬람교Korean
• islamasLithuanian
• islams; musulmanismsLatvian
• IslamMalay
• islamDutch
• islamNorwegian
• islamPolish
• اسلامPersian
• اسلامPashto
• IslãoPortuguese
• islamRomanian
• исламRussian
• islamSlovak
• islamSlovenian
• islamSerbian
• islamSwedish
• ศาสนาอิสลามThai
• İslâm, MüslümanlıkTurkish
• 回教Chinese (Trad.)
• ісламUkrainian
• اسلامUrdu
• đạo HồiVietnamese
• 伊斯兰教Chinese (Simp.)