plural authorities
Definition of authority
1a
: power to influence or command thought, opinion, or behavior
the president's authority
b
: freedom granted by one in authority : right
Who gave you the authority to do as you wish?
b
: a governmental agency or corporation to administer a revenue-producing public enterprise
the transit authority the city's housing authority
b
: convincing force
lent authority to the performance
4a(1)
: a citation (as from a book or file) used in defense or support
(2)
: the source from which the citation is drawn
He quoted extensively from the Bible, his sole authority.
b(1)
: a conclusive statement or set of statements (such as an official decision of a court)
(2)
: a decision taken as a precedent
(3)
: testimony
c
: an individual cited or appealed to as an expert
The prosecutor called the psychiatrist as an authority.
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- Which of these words does not mean "nonsense"?

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Merriam-Webster unabridged
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Time Traveler for authority
The first known use of authority was in the 13th century
See more words from the same century