A person who believes that no deities exist (especially, one who has no other religious belief). (noun)
A person who rejects belief that any deities exist (whether or not that person believes that deities do not exist). (noun)
A person who has no belief in any deities, such as a person who has no concept of deities. (noun)
A person who does not believe in a particular deity (or any deity in a particular pantheon), notwithstanding that they may believe in another deity. (noun)
Of or relating to atheists or atheism; atheistic. (adjective)
Examples of word atheist
"Our hope it to encourage non-religious members of our community to not shy away from the term atheist and for believers to recognize that atheists are not anti-theists."
To be clear, the term "atheist" is not synonymous with the terms "non-believer" or "none" a catch-all category used by many researchers.
Just as we thankfully no longer use the world colored, we should abandon the term atheist.
The word atheist is analogous to the denigrating word "colored" to describe African Americans, which was meant to say they are colored relative to the pure "standard" of white.
The solution is to abandon completely the use of the term atheist, just as polite society no longer uses the "N" word to describe African-Americans, "Rag Heads" for Arabs or "Wet Backs" for those south of the border.