From Middle English ooth, oth, ath, from Old English āþ ("oath"), from Proto-Germanic *aiþaz ("oath"), from Proto-Indo-European *h₁óytos ("oath"). Cognate with Scots aith, athe, North Frisian ith, iss, West Frisian eed ("oath"), Dutch eed ("oath"), German Eid ("oath"), Swedish ed ("oath"), Icelandic eið ("oath"), Latin ūtor ("use, employ, avail"), Old Irish óeth ("oath").
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