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English definition of “certainly”

certainly

adverb (IN NO DOUBT)    /ˈsɜː.tən.li/ US  /ˈsɝː-/
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."CertaintyConfidence and self-assurance 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!"CertaintyConfidence and self-assurance Grammar:Adverbs as short responses (definitely, certainly)See more
(Definition of certainly adverb (IN NO DOUBT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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