Longman Dictionary of Contemporary English homepage

definitive

 adjective
     
de‧fin‧i‧tive
1 [usually before noun] a definitive book, description etc is considered to be the best and cannot be improved
definitive study/work/guide etc
the definitive study of Victorian railway stations
2 a definitive agreement, statement etc is one that will not be changed:
a definitive agreement to buy the company
—definitively adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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