fulcrum
nounDefinition of fulcrum
1a
: prop
specifically
: the support about which a lever turns
the camera moves on a fixed fulcrum, either horizontally (panning) or vertically (tilting) — Gerald Mast
b
: one that supplies capability for action
he is … the reader's eyes and ears and the fulcrum of his judgment— Bernard De Voto
2
: a part of an animal that serves as a hinge or support