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certainly

 
/ˈsɜr·tən·li/ adv (KNOWING TO BE TRUE)

Definition

I value his opinion, and I’ll certainly miss him. I certainly don’t spend it watching TV in the evenings. When said in answer to a question asking for help, certainly means yes: "Can you give me a hand?" "Certainly."
(Definition of certainly adv (KNOWING TO BE TRUE) from the Cambridge Academic Content Dictionary © Cambridge University Press)

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