I always hear people say what an Atheist is. They speak with authority about the subject even though they don’t know what it is. I am going to tell you what it is. Right now. Flat out. In real terms.
An Atheist is this: A person that does not believe in gods, deities, or supreme beings. The opposite of a Theist.
That is it. No more, no less.
If anyone tells you differently. They are wrong. If someone tells you that Atheists think they can prove that a God doesn’t exist, they are wrong. If someone tells you that Atheists will believe anything because they dont believe in god, they are wrong.
An Atheist does not believe in supreme beings. There are different forms of Atheism, such as Strong Atheism and Weak Atheism, but the base of Atheism is simply stated as “the disbelief in supreme beings”
Got it?
-GRAtheist-
The Grand Rapids Atheist 
You’re right. The word “atheist” merely means “godless”. People always try to put another spin on it. But that’s it. “godless”. Can’t get much more simple than than.