Meaning of “definitely” in the English Dictionary

british dictionary

"definitely" in British English

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uk /ˈdef.ɪ.nə us /ˈdef.ən.ə

B1 without any doubt:

Have you definitely decided to go to Costa Rica?
He definitely said he'd be here.
"Are you going to have children?" "Oh, definitely (= without any doubt)."
"She's not coming?" "No, definitely not."

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(Definition of “definitely” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"definitely" in American English

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us /ˈdef·ə·nət·li/

without any doubt; certainly:

I don’t like that place – I’m definitely not going back there.
"Are you really going to quit your job?" "Definitely!"
Note: Definitely is often used for emphasis, esp. in speech.

(Definition of “definitely” from the Cambridge Academic Content Dictionary © Cambridge University Press)