- The definition of an atheist is a person who does not believe in the existence of any kind of God or higher power.
An example of an atheist is a person whose beliefs are based in science, such as the idea humans came from evolution rather than Adam and Eve.
atheist definition by Webster's New World
noun
a person who believes that there is no God
Origin: Middle French athéiste: see atheism
atheist definition by American Heritage Dictionary
noun
One who disbelieves or denies the existence of God or gods.
