Definition from macmillandictionary.com
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Charles was an authority on antique musical instruments.
The book is widely acknowledged to be the authority on regional English expressions.
The girl told the authorities that she had been kidnapped from her home.
The French authorities have refused to issue him a visa.
She took her complaint to the local health authority.
The rules are set by the passenger transport authority.
In practice it is difficult for the President to exercise his authority.
They don’t have the authority to close the canal.
Parents have legal authority over their children.
It is a subject on which she can write with authority.
There was a tone of authority in her voice.
He believed he had authority to ride the bike.