definitively

/dɪˈfɪnɪtɪvli/
adverb
  1. In a way that is final, conclusive, and cannot be changed or doubted.
    • She answered the question definitively, leaving no room for argument.
    • The scientist definitively proved that the theory was correct.
    • After years of debate, the court ruled definitively on the matter.
  2. In a way that is authoritative and completely reliable.
    • This book is definitively the best guide to birdwatching ever written.
    • He spoke definitively about the company's future plans.
    • The museum's collection is definitively the largest of its kind in the world.
What does "definitively" mean? | whatsthatwordmean | whatsthatwordmean