authoritative vs definitive

authoritative and definitive both are adjectives.

Word	Noun	Adjective	Verb	Adverb
authoritative	No	Yes	No	No
definitive	No	Yes	No	No

As adjectives, authoritative and definitive are synonyms defined as:

authoritative (adjective)	definitive (adjective)
endowed with authority	supplying or being a final or conclusive settlement
having authority or ascendancy or influence	clearly defined or formulated
of recognized authority or excellence	of recognized authority or excellence