oath Definition in the Cambridge English Dictionary
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Definition of “oath” - English Dictionary

Definition of "oath" - American English Dictionary

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oathnoun [C]

 us   /oʊθ/

oath noun [C] (PROMISE)

a ​seriouspromise 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)

Definition of "oath" - British English Dictionary

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oathnoun [C]

uk   /əʊθ/  us   /oʊθ/

oath noun [C] (PROMISE)

a ​promise, ​especially that you will ​tell the ​truth in a ​lawcourt: Medieval ​knights took an oath ofallegiance/​loyalty to ​theirlord. The ​witnessplaced her ​hand on the ​Bible and took the oath (= ​promised to ​tell the ​truth).be under/on oath to have ​formallypromised to ​tell the ​truth: The ​judgereminded the ​witness that she was under oath.

oath noun [C] (SWEAR WORD)

old-fashioned an ​offensive word, ​especially one that uses a ​name for ​God: muttering/​mouthing oaths
(Definition of oath from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "oath" - Business English Dictionary

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oathnoun [C]

uk   us   /əʊθ/
an ​official promise, especially when you promise to tell the truth in ​court: The ​witness took the oath. A psychologist cannot be compelled to ​attend a ​disciplinaryhearing or to swear on oath.
on/under oath LAW having ​officially promised to tell the truth in ​court: She was called to testify under oath before a congressional ​panel.
take the oath of office GOVERNMENT to ​accept a ​job in a ​government, especially in the US, in a ceremony which ​requires you to make an ​official promise to ​serve your country: The newly-elected ​Democrat took the oath of ​office in the Senate yesterday and quickly ​introduced his first ​bill.
(Definition of oath from the Cambridge Business English Dictionary © Cambridge University Press)
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