Noun

(tenacities)

The quality or state of being tenacious; as, tenacity, or retentiveness, of memory; tenacity, or persistency, of purpose.

* 2009 , , PHD Comics: Softball: younger and faster

— Our opponents may be younger, faster and less out of shape than we are, but we have something they’ll never have!

— Tenure?

— Tenacity!

The quality of bodies which keeps them from parting without considerable force; cohesiveness; the effect of attraction; – as distinguished from brittleness, fragility, mobility, etc.

The quality of bodies which makes them adhere to other bodies; adhesiveness; viscosity.

The greatest longitudinal stress a substance can bear without tearing asunder, – usually expressed with reference to a unit area of the cross section of the substance, as the number of pounds per square inch, or kilograms per square centimeter, necessary to produce rupture.

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.