"authoritative" in the adjective sense
1. authoritative, important
having authority or ascendancy or influence
"an important official"
"the captain's authoritative manner"
2. authoritative, definitive
of recognized authority or excellence
"the definitive work on Greece"
3. authoritative, authorized, authorised
sanctioned by established authority
"an authoritative communique"
"the authorized biography"
Source: WordNet® (An amazing lexical database of English)
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