Plural of atheism; multiple forms, expressions, or instances of the lack of belief in deities or active disbelief in the existence of gods.
From French 'athéisme' (16th century), combining Greek 'a-' (without) + 'theos' (god) + '-ism' (belief system). The plural reflects multiple types or instances of non-belief.
Historians discovered that ancient atheisms were surprisingly diverse—Greek atomists had different reasons for rejecting gods than later Enlightenment atheists, showing it's not one monolithic belief but many!
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