Definitions from Wiktionary (authority)

▸ noun:  (uncountable) Power or right to make or enforce rules, give orders, or impose obligation; or a position having such power or right.
▸ noun:  (plural) Persons, regarded collectively, who occupy official positions of power; police or law enforcement.
▸ noun:  (countable) A reliable, definitive source of information on a subject.
▸ noun:  (uncountable) Status as a trustworthy source of information, reputation for mastery or expertise; or claim to such status or reputation.
▸ noun:  (uncountable) Official permission; authorisation to act in some capacity on behalf of a ruling entity.
▸ noun:  (countable) A government-owned agency that runs a revenue-generating activity for public benefit.

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