Webster's English Dictionary

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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