from freedictionary.com
Noun 1.
atheist - someone who denies the existence of god
disbeliever, nonbeliever, unbeliever - someone who refuses to believe (as in a divinity)
Adj. 1.
atheist - related to or characterized by or given to atheism; "atheist leanings"
Here is Webster's definition of atheism:
atheism n 1 a: disbelief in the existence of God or any other deity b: the doctrine that there is neither god nor any other deity--
Bigger Business, is the problem you have w/the term atheist that it gives so much credence to the existence of a God?
I guess I've often wondered about why someone who claims to not believe in something would label themselves w/a term that includes the very thing they say they do not believe in.