definitive

A definitive answer is a final one. A definitive decision by a court of law is one that will not be changed. A definitive translation is one everyone turns to as correct. Definitive means authoritative, conclusive, final.

Be careful not to confuse definitive with definite. Definite means clearly defined. You can have a definite opinion that JFK could not have been assassinated by a lone gunman, but the definitive interpretation remains that of the Warren Commission Report, which held there was only one.

Definitions of definitive
1

adj clearly defined or formulated

Synonyms:
unequivocal
explicit, expressed
precisely and clearly expressed or readily observable; leaving nothing to implication

adj of recognized authority or excellence

“the definitive work on Greece”
Synonyms:
authoritative, classic, classical
standard
established or well-known or widely recognized as a model of authority or excellence

adj supplying or being a final or conclusive settlement

“a definitive verdict”
Synonyms:
determinate
conclusive
forming an end or termination; especially putting an end to doubt or question

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