atheist /ˈeɪ.θi.ɪst/noun 6adjective 1verb 1forms 5 noun6 •A person who does not believe in deities or gods. •A person who is certain that no deities exist or who thinks that the existence of deities can be disproven.Ageine, the Atheistes, which say in their hartes there is no God; […] — 1571 •A person who doubts the existence of deities (therefore, an agnostic may be considered an atheist).Very low probability, but short of zero. De facto atheist. ‘I cannot know for certain but I think God is very improbable, and I live my life on the assumption that he is not there.’ — 2006 •Any person lacking belief in deities (including children who are unaware of religion).All children are born Atheists; they have no idea of God. Are they then criminal on account of their ignorance? — 1772 •(nonstandard) A person who does not believe in any religion (not even a religion without gods); a nonreligious person.Moreover, we also know that an atheist or agnostic is statistically more likely to be autistic than neurotypical and a religious believer is statistically more likely to be neurotypical than autistic. — 2019 •A person who does not believe in a particular deity (but may believe in another deity). adjective1 •Of or relating to atheists or atheism; atheistic. verb1 •(rare) To make someone an atheist. formsatheisted · atheisting · atheists · more atheist · most atheist