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Adverb: certainly  sur-t(u)n-lee
  1. Definitely or positively
    "she certainly is a hard worker";
    - surely, sure, for sure, for certain, sure enough, sure as shooting
Interjection: certainly  sur-t(u)n-lee
  1. Indicates an affirmative response
    - ay [dialect], aye [dialect], sure [informal], uh-huh [informal], yah [UK, informal], yea [informal], yeah [informal], yep [informal], yes, yup [informal], ya [S.Africa, informal]

Encyclopedia: Certainly