Definition of definitively adverb from the Oxford Advanced Learner's Dictionary

 

definitively

 adverb
adverb
BrE BrE//dɪˈfɪnətɪvli//
 
; NAmE NAmE//dɪˈfɪnətɪvli//
 
 
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finally; in a way that cannot be changed or challenged the difficulty of definitively proving guilt