pivot
1. piv.ot \'piv-*t\ n [F] 1: a shaft or pin on which something turns 2: a person, thing, or factor having a major or central role, function, or effect 3: the action of pivoting 2. pivot vi : to turn on or as if on a pivot 1: to provide with, mount on, or attach by a pivot 2: to cause to pivot 3. pivot aj 1: turning on or as if on a pivot 2: PIVOTAL