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authoritative
au·thor·i·ta·tive [ ə tháwrə tàytiv ]


adjective 
Definition:
 
1. reliable: convincing, reliable, backed by evidence, and showing deep knowledge
2. backed by authority: backed by an established and accepted authority
3. showing authority: showing confidence in or the expectation of being obeyed

au·thor·i·ta·tive·ly adverb
au·thor·i·ta·tive·ness noun
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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