Authoritative Definition

ə-thôrĭ-tātĭv, ə-thŏr-, ô-
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

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