Essential Meaning of definitely
: without doubt : in a way that is certain or clear The new model is definitely an improvement. The party will definitely be next week. See More ExamplesThe room is definitely not ready. "Will you come over on Saturday?" "Definitely!" [=yes]
Full 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!"
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