Authoritative Definition
 ə-thôrĭ-tātĭv, ə-thŏr-, ô- 
    adjective
  
 Having or arising from authority; official.
 An authoritative decree; authoritative sources.
 American Heritage 
Having or showing authority; official.
 Webster's New World 
Of acknowledged accuracy or excellence; highly reliable.
 An authoritative account of the revolution.
 American Heritage 
Based on competent authority; reliable because coming from one who is an expert or properly qualified.
 An authoritative biography.
 Webster's New World 
Demonstrating authority; commanding.
 The captain's authoritative manner.
 American Heritage 
Synonyms: 
 Antonyms: 
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