Definitions

1. noun

A person who does not believe in the existence of God or gods.

“As an atheist, John did not celebrate any religious holidays.”

2. noun

A person who denies the possibility of divine revelation, especially a person who rejects theism.

“The philosopher’s argument was that of an atheist, challenging the idea of a higher power.”

3. adjective

Lacking or denying God or gods.

“Atheist ideologies are increasingly influential in modern society.”