certainly Definition in Cambridge British English Dictionary
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Definition of "certainly" - British English Dictionary

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certainlyadverb

uk   /ˈsɜː.tən.li/  us   /ˈsɝː-/

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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certainly adverb (EXTREMELY LIKELY)

very likely to happen: She will certainly win the election if the opinion polls are accurate.
(Definition of certainly from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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