authority
When referring to the power to give orders, "authority" is usually an uncountable noun (e.g., "He has authority"). When referring to a person or organization in charge, it is often used in the plural form ("the authorities") to describe government or police bodies. When describing an expert, "authority" is a countable noun and is typically followed by the preposition "on" (e.g., "an authority on art").
💬Casual Conversation
David wants the mocks by 5. Does he even have the authority to move the deadline?
Hardly. He's just winging it and hoping we don't notice.
Meanings
The power or right to give orders, make decisions, and enforce obedience.
"The police officer has the authority to arrest suspects."
A person or organization having power or control over others.
"She reported the incident to the local health authority."
A person with extensive knowledge in a particular subject.
"He is recognized as a leading authority on medieval history."