Pivot

Webster's Dictionary of the English Language

·vt To place on a pivot.

II. Pivot ·noun A fixed pin or short axis, on the end of which a wheel or other body turns.

III. Pivot ·noun The end of a shaft or arbor which rests and turns in a support; as, the pivot of an arbor in a watch.

IV. Pivot ·noun The officer or soldier who simply turns in his place whike the company or line moves around him in wheeling;

— called also pivot man.

V. Pivot ·noun Hence, figuratively: A turning point or condition; that on which important results depend; as, the pivot of an Enterprise.