(1):

(v. t.) To place on a pivot.

(2):

(n.) The end of a shaft or arbor which rests and turns in a support; as, the pivot of an arbor in a watch.

(3):

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

(4):

(n.) The officer or soldier who simply turns in his place whike the company or line moves around him in wheeling; - called also pivot man.

(5):

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