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Adjective: authoritative  u'thó-ri,tey-tiv [N. Amer], o'thó-ri-tu-tiv [Brit]
  1. Having authority, ascendancy or influence
    "the captain's authoritative manner";
    - important
     
  2. Of recognized authority or excellence
    - definitive
     
  3. Sanctioned by established authority
    "an authoritative communiqué";
    - authorized, authorised [Brit]

See also: influential, official, standard

Encyclopedia: Authoritative

Nearest

authoring language
authorisation
authorise
authorised
Authorised Version
authoriser
authoritarian
authoritarian regime
authoritarian state
authoritarianism
authoritative
authoritatively
authorities
authority
authority figure
authorization
authorize
authorized
authorized shares
authorized stock
Authorized Version