def·​i·​nite·​ly | \ˈde-fə-nit-lē, ˈdef-nət-\

Definition of definitely 

1 : in a definite way : in a way free of all ambiguity, uncertainty, or obscurity I will definitely be there. He's very smart and very funny and is definitely a practical actor. He comes to work to get his job done and to make the best movie possible …— Anna Kendrick Omaha is definitely not hip; green-haired XML programmers do not glide past gourmet coffee emporiums on Razor scooters.— Adam Rogers

2a used in speech as a forceful way of expressing agreement or saying "yes" "Do you think they'll win?" "Definitely!"

b used in speech in the phrase definitely not as a forceful way of expressing disagreement or saying "no" "Do you agree with him?" "Definitely not!"

First Known Use of definitely

1574, in the meaning defined at sense 1

History and Etymology for definitely

definite + -ly entry 2

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The first known use of definitely was in 1574

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to enclose within walls

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