adjective a word that describes or modifies a noun or pronoun, in this case, 'definitive' describes something that is authoritative or conclusive
The definitive experiment that proves a theory.
The definitive work of an author or genre.
The definitive ruling in a legal case.
The definitive diagnosis of a medical condition.
The definitive version of a word's meaning.
The author's latest novel is considered the definitive work on the subject.
The psychologist's research provided the definitive evidence needed for the case.
The historian's detailed analysis of the documents resulted in the definitive account of the event.
The scientist's groundbreaking experiment produced the definitive results in the field.
The lawyer presented the definitive argument that swayed the jury in favor of their client.