From BiblePortal Wikipedia
Webster's Dictionary 
(1): ( n.) A god or goddess; a heathen god.
(2): ( n.) The collection of attributes which make up the nature of a god; divinity; godhead; as, the deity of the Supreme Being is seen in his works.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature 
a name of the Supreme Being, from the Latin Deus, God. It was originally an abstract term, and thence transferred to signify, in a concrete sense, Him whom we call GOD.