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REFERENCE

certainly

adv.
US //ˈsɝtənɫi// UK //sˈɜːtənli// cer·tain·ly
  1. 1 without doubt (adv.)
    A2 Elementary

    used to emphasize that something is definitely true or will happen.

    used to indicate that the speaker has no doubt about the truth of a statement. Often functions as a sentential adverb to modify the entire proposition.

    Example

    The weather is certainly getting colder now that it is November.

    Example

    The recent data certainly suggests that the economic recovery is more fragile than the initial reports had indicated.
  2. 2 yes, of course (adv.)
    A2 Elementary

    used as a polite and strong way of saying 'yes' when someone asks you something.

    used as an emphatic affirmative response to a request or question, functioning as a discourse marker of agreement.

    Example

    "Could you help me with this bag?" "Certainly, I would be happy to."

    Example

    When asked if the department would support the new initiative, the director replied, "Certainly, provided the budget remains within the agreed limits."
Origin

From Middle English certeynly; equivalent to certain + -ly.

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