Noun

(label) The power to enforce rules or give orders.

* 1883 , (Howard Pyle), (The Merry Adventures of Robin Hood)

But in the meantime Robin Hood and his band lived quietly in Sherwood Forest, without showing their faces abroad, for Robin knew that it would not be wise for him to be seen in the neighborhood of Nottingham, those in authority being very wroth with him.

(label) Persons in command; specifically, government.

*{{quote-book, year=1927, author= F. E. Penny

, chapter=4, title= Pulling the Strings , passage=The case was that of a murder. It had an element of mystery about it, however, which was puzzling the authorities . A turban and loincloth soaked in blood had been found; also a staff.}}

* {{quote-magazine, date=2013-08-10, volume=408, issue=8848, magazine=(The Economist)

, title= Legal highs: A new prescription , passage=No sooner has a [synthetic] drug been blacklisted than chemists adjust their recipe and start churning out a subtly different one. These “legal highs” are sold for the few months it takes the authorities to identify and ban them, and then the cycle begins again.}}

(label) A person accepted as a source of reliable information on a subject.

* 1930 September 18, Albert Einstein, as quoted in Albert Einstein: Creator and Rebel (1988) by Banesh Hoffman

To punish me for my contempt of authority', Fate has made me an ' authority myself.

Noun

(en noun)

A device that controls or limits something.

The voltage regulator stopped working and the resulting overload destroyed the device.

A person or group that sets standards of practice, especially those established by law.

A very accurate clock, used by clockmakers to measure the timekeeping of each newly made clock.