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AUTHORITATIVE

Definition:

1. [adjective] having authority or ascendancy or influence; "an important official"; "the captain's authoritative manner"
   Synonyms: important
   
   
2. [adjective] of recognized authority or excellence; "the definitive work on Greece"; "classical methods of navigation"
   Synonyms: classical, definitive
   
   
3. [adjective] sanctioned by established authority; "an authoritative communique"; "the authorized biography"
   Synonyms: authorized, authorised
   
   

Synonyms:

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