Etymology
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authoritative (adj.)

c. 1600, "dictatorial" (a sense now restricted to authoritarian), earlier auctoritative (implied in auctoritativeli "with official approval or sanction"), from Medieval Latin auctoritativus, from Latin auctoritatem (see authority). Meaning "having due authority, entitled to credence or obedience" is from 1650s; that of "proceeding from proper authority" is from 1809. Related: Authoritatively; authoritativeness.

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Definitions of authoritative

authoritative (adj.)
having authority or ascendancy or influence;
the captain's authoritative manner
Synonyms: important
authoritative (adj.)
of recognized authority or excellence;
Synonyms: definitive
authoritative (adj.)
sanctioned by established authority;
an authoritative communique
Synonyms: authorized / authorised
From wordnet.princeton.edu