Noun

(en noun)

A thing on which something turns; specifically a metal pointed pin or short shaft in machinery, such as the end of an axle or spindle.

Something or someone having a paramount significance in a certain situation.

* {{quote-book, year=1905, author=

, title= , chapter=1 citation , passage=“The story of this adoption is, of course, the pivot round which all the circumstances of the mysterious tragedy revolved. Mrs. Yule had an only son, namely, William, to whom she was passionately attached ; but, like many a fond mother, she had the desire of mapping out that son's future entirely according to her own ideas. […]”}}

Act of turning on one foot.

* 2012 , Banking reform: Sticking together , The Economist, 18th August issue

Sandy Weill was the man who stitched Citigroup together in the 1990s and in the process helped bury the Glass-Steagall act, a Depression-era law separating retail and investment banking. Last month he performed a perfect pivot : he now wants regulators to undo his previous work.

(military) The officer or soldier who simply turns in his place while the company or line moves around him in wheeling.

(roller derby) A player with responsibility for co-ordinating their team in a particular jam.

(computing) An element of a set to be sorted that is chosen as a midpoint, so as to divide the other elements into two groups to be dealt with recursively.

Noun

(en noun)

(chiefly, uncountable) The act of turning around a centre or an axis.

*{{quote-magazine, date=2013-03

, author=Frank Fish, George Lauder , title=Not Just Going with the Flow , volume=101, issue=2, page=114 , magazine= citation , passage=An extreme version of vorticity is a vortex . The vortex is a spinning, cyclonic mass of fluid, which can be observed in the rotation of water going down a drain, as well as in smoke rings, tornados and hurricanes.}}

The earth's rotation about its axis is responsible for its being slightly oblate rather than a sphere.

A single complete cycle around a centre or an axis.

Earth's moon completes a rotation every twenty-seven days or so.

A regular variation in a sequence.

crop rotation

The medical resident finished a two-week rotation in pediatrics and began one in orthopaedics.

(mathematics) An operation that a continuous isometry deformation that fixes at least one point can result in.

The function mapping (''x'',''y'') to (''&

x2212;y'',''x'') is a rotation .

(baseball) The set of (soplink) of a team.

(aviation) The step during takeoff when the pilot commands the vehicle to lift the nose wheel off the ground during the takeoff roll.