1. Having authority or ascendancy or influence
   "the captain's authoritative manner"
   - important 
2. Of recognized authority or excellence
   - classical, classic, definitive 
3. Sanctioned by established authority
   "an authoritative communiqué"
   - authorized, authorised [Brit]

See also: authoritatively, influential, official, standard

Encyclopedia: Authoritative

• revaluation
• revalue
• revamp
• reveal
• revealed religion
• revealer
• revealing
• revealingly
• revegetate
• reveille
• revel
• revelation
• Revelation of Saint John the Divine
• revelatory
• reveler
• reveller
• revelry
• revenant
• revenge
• revengeful
• revengefully
• Louisianian
• Louisville
• lounge
• lounge about