Definition of "atheist" in English

noun

1. (religion) A person who does not believe in deities or gods.

2. (uncommon) A person who does not believe in a particular deity (but may believe in another deity).

3. (sometimes proscribed) A person who does not believe in any religion (not even a religion without gods); a nonreligious person.

adjective

1. Of or relating to atheists or atheism; atheistic.

verb

1. (transitive, very rare) To make someone an atheist.