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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, aye, sure, uh-huh, yah [UK], yea, yeah, yep, yes, yup, ya [S.Africa]