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Atheism (derived from the Ancient Greek ἄθεος "atheos" meaning "without gods; godless; secular; denying or disdaining the gods, especially officially sanctioned gods") is the absence or rejection of the belief that deities exist. The English term was used at least as early as the sixteenth century and atheistic ideas and their influence have a longer history. Over the centuries, atheists have supported their lack of belief in gods through a variety of avenues, including scientific, philosophical, and ideological notions.
Greek ἄθεος "atheos"