Pivot

Part of speech: noun (n.)

1. A fixed pin or short axis, on the end of which a wheel or other body turns.

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. Hence, figuratively: A turning point or condition; that on which important results depend; as, the pivot of an enterprise.

4. 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.

Part of speech: verb (v.)

To place on a pivot. Clarke.