Definition of definitive adjective from the Oxford Advanced American Dictionary

      

    definitive

     adjective
    adjective
    NAmE//dɪˈfɪnət̮ɪv//
     
     
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  1. 1final; not able to be changed a definitive agreement/answer/statement The definitive version of the text is ready to be published.
  2. 2[usually before noun] considered to be the best of its kind and almost impossible to improve the definitive biography of Einstein the definitive guide to the golf courses of California
definitively
 
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adverb
See the Oxford Advanced Learner's Dictionary entry: definitive