Meaning of “certainly” in the English Dictionary

"certainly" in British English

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certainlyadverb

uk /ˈsɜː.tən.li/ us /ˈsɝː.tən.li/

certainly adverb (IN NO DOUBT)

A2 used to reply completely or to emphasize something and show that there is no doubt about it:

She certainly had a friend called Mark, but I don't know whether he was her boyfriend.
"This is rather a difficult question." "Yes, it's certainly not easy."
"Do you think more money should be given to education?" "Certainly!"
"Had you forgotten about our anniversary?" "Certainly not! I've reserved a table at Michel's restaurant for this evening."

A2 used when agreeing or disagreeing strongly to a request:

"Could you lend me £10?" "Certainly."
"Did you take any money out of my purse?" "Certainly not!"

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

"certainly" in American English

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certainlyadverb

us /ˈsɜr·tən·li/

certainly adverb (KNOWING TO BE TRUE)

When said in answer to a question asking for help, certainly means yes:

"Can you give me a hand?" "Certainly."

(Definition of “certainly” from the Cambridge Academic Content Dictionary © Cambridge University Press)