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oath (n.)

Middle English oth, from Old English "judicial swearing, solemn appeal (to deity, sacred relics, etc.), in witness of truth or a promise," from Proto-Germanic *aithaz (source also of Old Norse eiðr, Swedish ed, Old Saxon, Old Frisian eth, Middle Dutch eet, Dutch eed, German eid, Gothic aiþs "oath"), from PIE *oi-to- "an oath" (source also of Old Irish oeth "oath"). Common to Celtic and Germanic, possibly a loan-word from one to the other, but the history is obscure and it may ultimately be non-Indo-European. In reference to careless invocations of divinity, from late Old English.

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Definitions of oath from WordNet

oath (n.)
profane or obscene expression usually of surprise or anger;
Synonyms: curse / curse word / expletive / swearing / swearword / cuss
oath (n.)
a commitment to tell the truth (especially in a court of law); to lie under oath is to become subject to prosecution for perjury;
Synonyms: swearing
oath (n.)
a solemn promise, usually invoking a divine witness, regarding your future acts or behavior;
they took an oath of allegiance
From wordnet.princeton.edu