definitely

/ˈde-fə-nit-lē/

adverb

  1. in a definite way : in a way free of all ambiguity, uncertainty, or obscurity

  2. —used in speech as a forceful way of expressing agreement or saying "yes"

  3. —used in speech in the phrase definitely not as a forceful way of expressing disagreement or saying "no"

I will definitely be there.