Dictionary
au•thor•i•ta•tive
Pronunciation: (u-thôr'i-tā"tiv, u-thor'-), [key]—
adj.
1. having due authority; having the sanction or weight of authority:
an authoritative opinion.
2. substantiated or supported by documentary evidence and accepted by most authorities in a field:
an authoritative edition of Shakespeare; an authoritative treatment of a subject.
3. having an air of authority; accustomed to exercising authority; positive; peremptory; dictatorial:
said with an authoritative air. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.