DictionaryAI

definitely

adverb
DEF-i-nit-lee/ˈdɛf.ɪ.nɪt.li/

2 meanings of definitely

Practice

  1. 1
    certainlyadverb
    In a way that is completely sure, with no doubt at all.

    Like saying "yes, for sure" with no maybe about it.

    I will definitely be there for your birthday party.

    She is definitely the best singer in our whole school.

    UsageSpell it definitely (not incorrect: definately). Put it after will or is: I will definitely come.

    Similarcertainly, undoubtedly, absolutely, unquestionably, positively

    Oppositepossibly, perhaps

  2. 2
    firmlyadverb
    In a clear and firm way that leaves no doubt.

    I can't tell you definitely until I check my calendar.

    The date of the party has not been definitely set yet.

    UsageOften with not: I can't tell you definitely.

    Similardecisively, firmly, clearly, emphatically

    Oppositehesitantly, tentatively, vaguely, indecisively

Use it in a sentence

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Origin

It comes from the word "definite" plus the ending "-ly."

Checked 5 Nov 2026 · 1 fact