Definition of “oath” - English Dictionary

(Definition of “oath” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“oath” in American English

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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)

“oath” in Business English

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oathnoun [ C ]

uk /əʊθ/ us

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 disciplinary hearing 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)