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fulcrum

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The definition of a fulcrum is a pivot point around which a lever turns, or something that plays a central role in or is in the center of a situation or activity.

(noun)

A pivot point around which a lever turns is an example of a fulcrum.
A person around whom all activity revolves is an example of the fulcrum.

See fulcrum in Webster's New World College Dictionary

noun pl. fulcrums or fulcra

1. the support or point of support on which a lever turns in raising or moving something
2. Zool. any structure that supports or acts like a fulcrum
a means of exerting influence, pressure, etc.

Origin: L, bedpost, support, akin to fulcire: see balk

See fulcrum in American Heritage Dictionary 4

noun pl. ful·crums or ful·cra (-krə)