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certainly

The definition of certainly is absolutely or definitely.

(adverb)

An example of certainly used as an adverb is in the sentence, "We will certainly buy some cookies," which means "We will absolutely buy some cookies."

See certainly in Webster's New World College Dictionary

adverb

beyond a doubt; surely
yes

See certainly in American Heritage Dictionary 4

adverb

Undoubtedly; definitely: This is certainly not my writing.
By all means; of course: You may certainly join us.
Surely: They certainly are hard workers.

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