Longman Dictionary of Contemporary English homepage

authoritative

 adjective
     
au‧thor‧i‧ta‧tive
1 an authoritative book, account etc is respected because the person who wrote it knows a lot about the subject:
the most authoritative work on English surnames
2 behaving or speaking in a confident, determined way that makes people respect and obey you:
He has a commanding presence and an authoritative voice.
—authoritatively adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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