definitive

de|fini|tive /dɪf'ɪnɪtɪv/
1 [ADJ] usu ADJ n
Something that is definitive provides a firm conclusion that cannot be questioned.
No one has come up with a definitive answer as to why this should be so...
definitively [ADV]
The Constitution did not definitively rule out divorce.
2 [ADJ] usu ADJ n
A definitive book or performance is thought to be the best of its kind that has ever been done or that will ever be done.
His `An Orkney Tapestry' is still the definitive book on the islands.

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