oath Definition in Cambridge American English Dictionary
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Definition of "oath" - American English Dictionary

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oathnoun [C]

 us   /oʊθ/

oath noun [C] (PROMISE)

a serious promise that you will tell the truth or that you will do what you have said: Presidents take an oath to uphold the Constitution.

oath noun [C] (RUDE WORD)

literature dated an offensive word, esp. one that uses a name for God
(Definition of oath from the Cambridge Academic Content Dictionary © Cambridge University Press)
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