PIVOT

pivot. Pivot, n. a pin upon which a thing turns round

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Piv″ot (?), n. [[F.; prob. akin to It. piva pipe, F. pipe. See Pipe.]] 1. 1. A fixed pin or short axis, on the end of which a wheel or other body turns.
2. 2. The end of a shaft or arbor which rests and turns in a support; as, the pivot of an arbor in a watch.
3. 3. Hence, figuratively: A turning point or condition; that on which important results depend; as, the pivot of an enterprise.
4. 4. (Mil.) The officer or soldier who simply turns in his place whike the company or line moves around him in wheeling; — called also pivot man.
Pivot bridge, a form of drawbridge in which one span, called the pivot span, turns about a central vertical axis. — Pivot gun, a gun mounted on a pivot or revolving carriage, so as to turn in any direction. — Pivot tooth (Dentistry), an artificial crown attached to the root of a natural tooth by a pin or peg.