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1a : a lack of belief or a strong disbelief in the existence of a god or any gods

b : a philosophical or religious position characterized by disbelief in the existence of a god or any gods

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1546, in the meaning defined at sense 2

Middle French athisme, from athe atheist, from Greek atheos godless, from a- + theos god

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Atheism. Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/atheism. Accessed 10 Aug. 2020.

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Atheism | Definition of Atheism by Merriam-Webster