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Atheism is in the broadest sense an absence of belief in the existence of deities. Less broadly, atheism is a rejection of the belief that any deities exist. In an even narrower sense, atheism is specifically the position that there are no deities. Atheism is contrasted with theism, which in its most general form is the belief that at least one deity exists. The etymological root for the word atheism originated before the 5th century BCE from the ancient Greek ἄθεος, meaning "without god ".