I gave you the simple definition of atheism and atheist. All the rest of the definitions suggest the same meaning, although many of them do it with an abundance of words.

Since I also showed you that, even if there happened to be no God, the atheist himself is the supreme being he is trying to deny, all you jokers are doing is batting at the air... air that you happen to attach words to, because words are easy.

Since I also showed you that God exists through 3 common scientific laws, atheism is a complete nullity. All that atheists want to do is make noise to prove they are something. But you jokers don't have to do this. God knows you are there, and He accepts you. Now accept Him.

Too bad for you atheist jokers. There isn't anything there in you. And there won't be until you start to accept the fact that God exists.

Definition of atheism in English:
noun
[mass noun]
Disbelief or lack of belief in the existence of God or gods.