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English definition of “oath”

oath

noun [C] (PROMISE)    /əʊθ/ US  /oʊθ/
a promise , especially that you will tell the truth in a law court : Medieval knights took an oath of allegiance / loyalty to their lord . The witness placed her hand on the Bible and took the oath (= promised to tell the truth ).Making and breaking promises and commitmentsCourt cases, orders and decisions be under/on oath to have formally promised to tell the truth : The judge reminded the witness that she was under oath.Making and breaking promises and commitmentsCourt cases, orders and decisions
(Definition of oath noun (PROMISE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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