Both Uses

definitive
in
Where She Went
(Auto-generated)

But now that your second major-label album is out and your harder sound is, I think we can all agree, established, I'm wanting to write a definitive survey.†
p. 13.4
For all her talk of writing definitive surveys, for all her investigative skills, she's no different from all the other hack journalists and stalker photographers, dying to be the first to deliver a big scoop, either on a birth: Is It Twins for Adam and Bryn?†
p. 21.6 *

Definitions:

(1) (definitive)
best possible, final, or definite (beyond question)
(2) (meaning too rare to warrant focus)
Much less commonly, definitive can describe something that defines or distinguishes a category, as in "The definitive characteristic of news is newness," or "Is there a single trait that is definitive of addictive personality disorder?"

Even more rarely, definitive can refer to a standard postage stamp. See a comprehensive dictionary for specializes senses in biology and grammar.