1
as in expert
a person with a high level of knowledge or skill in a field
the leading authority on neural anatomy
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2
as in government
lawful control over the affairs of a political unit (as a nation)
the sheriff had authority over the whole county
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3
as in influence
the power to direct the thinking or behavior of others usually indirectly
speaks with a persuasive authority on matters of public health
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4
as in power
the right or means to command or control others
by the authority vested in me, I now pronounce you married
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5
as in reason
something (as a belief) that serves as the basis for another thing
I had good authority to believe that the information was correct
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6
7
as in effectiveness
the capacity to persuade
a strict grammarian whose pronouncements carried plenty of authority with my third-grade English teacher
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Merriam-Webster unabridged
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