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From Webster's Dictionary:
One that supplies capability for action
From the American Heritage Dictionary:
The point on which a lever pivots;
An anatomical structure that acts as a hinge or a point of support;
An agent through which vital powers are exercised.
"The secret is, all the energy and potency exists at the fulcrum point."
Barbara Hand Clow
"We will hold a vision of possibilities and then seed or stir the pot to catalyze and manifest new pieces of that vision."
From the 4/4/06 Fulcrum minutes