In Christianity, Judaism, and Islam, the supreme evil being or the enemy of God; also used to mean any extremely evil person.
From Hebrew 'Satan,' meaning 'adversary' or 'opponent.' The word is not originally a name but a title describing a role—'the Satan' meant 'the accuser.' It was adopted into Greek, Latin, and modern European languages.
Fascinatingly, 'Satan' wasn't originally a proper name but a job title meaning 'accuser'—like calling someone 'the prosecutor.' Different religions evolved the concept completely differently, showing how the same word can mean vastly different things depending on religious tradition.
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