(February 14, 2015 at 4:41 am)jesus_wept Wrote: the doctrine or belief that there is no God. http://dictionary.reference.com/browse/atheism
Disbelief or lack of belief in the existence of God or gods. http://www.oxforddictionaries.com/defini...sh/atheism
You gave the first definition from dictionary.com, and it's certainly a good definition; that's a common usage.
Dictionary.com follows up that first definition with a second definition quite similar to the one from the OeD: "disbelief in the existence of a supreme being or beings."
So any theist arguing that dictionary.com provides the single definition of "atheism" should be made to face the fact that dictionary.com itself offers the alternative definition that you and I prefer.