Formal promises or vows, especially ones made in front of witnesses or in court, where someone swears to tell the truth or keep a promise.
From Old English 'āth', related to German 'Eid'. The word has ancient Germanic roots and the oath itself was a sacred ritual in medieval cultures.
Oaths are older than written law—ancient societies used them because swearing a sacred oath and then breaking it was thought to bring divine punishment, so they were more binding than any contract could be!
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