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1 definition by Hamdan

 
1.
Contraction of the Arabic: al-illah (THE GOD), used by Muslims to emphasis God's oneness and to distinguish their deity from those of the medieval pagan Arabs. The word, however, is not exclusive to Islam, but is simply the Arabic word for the God of the Abrahamic faiths.

Allah is used by Arabic-speaking Christians and Jews to refer to their God.
Anyone who thinks that the word Allah refers only to the Muslim God does not know Arabic, nor did he bother to ask anyone that does.
by Hamdan March 15, 2010