This is the 2870th most frequent French word.
définitif
Final; permanent.
Here, 'définitif' is used to convey the sense of finality and irrevocability of the response.
Cette réponse est définitive.
This answer is final.
In this context, 'définitif' describes the solution as complete and final, leaving no remaining issues.
Il a trouvé une solution définitive à son problème.
He found a definitive solution to his problem.
Here, 'définitif' qualifies the edition to indicate that it is the final and authoritative version.