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

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oath

noun [C]
 
 
/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 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)
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