adverb

certainly

certainly, definitely, surely

He will certainly be there.

He will certainly be there.

"Can you help me?" "Certainly."

"Can you help me?" "Certainly."

((certainly + verb)) without doubt. This will certainly help.

((as a response)) used to agree to a request. "Can I borrow this?" "Certainly."

Synonyms: definitely, surely, undoubtedly; Antonyms: possibly, maybe

From the adjective 'certain' + the adverbial suffix '-ly'.

It's simply the adverb form of 'certain'. Use it when you state something with certainty.

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