The Arabic word Islam means peace, submission and obedience. The religion of Islam is the complete acceptance of the teachings and guidance of God as revealed to His Prophet Muhammad (PBUH).
A Muslim is one who believes in God and Strives for total reorganization of his life according to His revealed guidance and the saying of the Prophet.
He also works for building human society on the same basis. "Mohammedanism" is a misnomer for Islam and offends its very spirit.
The word "Allah" is the proper name of God in Arabic. It is a unique term because it has no plural or feminine gender.