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definitive (adj) (of a book, a study, an agreement, etc.) not able to be changed or improved upon.
A definitive book on a subject is the most informative, the most reliable, and the best ever on the subject. A better book on the subject is not possible. It is complete in all respects. A definitive statement or agreement is one that cannot be changed.
- In the field of science, no treatise on any subject can be taken as definitive as there is always scope for further research.
- The movie 'Gandhi', the result of diligent research and thorough study, is a definitive portrayal of the character, personality, and the life of Mahatma Gandhi.