certainly Definition in the Cambridge English Dictionary
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Definition of “certainly” - English Dictionary

Definition of "certainly" - American English Dictionary

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certainlyadverb

 us   /ˈsɜr·tən·li/

certainly adverb (KNOWING TO BE TRUE)

When said in ​answer to a ​questionasking for ​help, certainly ​means yes: "Can you give me a ​hand?" "Certainly."
(Definition of certainly from the Cambridge Academic Content Dictionary © Cambridge University Press)

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 ​replycompletely 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 ​difficultquestion." "Yes, it's certainly not ​easy." "Do you ​think more ​money should be given to ​education?" "Certainly!" "Had you ​forgotten about ​ouranniversary?" "Certainly not! I've ​reserved a ​table at Michel's ​restaurant for this ​evening."A2 used when ​agreeing or ​disagreeingstrongly 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 ​opinionpolls are ​accurate.
(Definition of certainly from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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