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certainly (adv.)

"without doubt or question, assuredly," c. 1300, from certain + -ly (2).

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Definitions of certainly from WordNet

certainly (adv.)
definitely or positively (`sure' is sometimes used informally for `surely');
she certainly is a hard worker
Synonyms: surely / sure / for sure / for certain / sure enough / sure as shooting
From wordnet.princeton.edu