Definition of Keystone
Keystone
key·stone
Definition/Meaning
(noun)
the stone located at the center of an arch at its highest point, often wedge-shaped, and serving to lock the other stones in place;
e.g. The keystone was engraved with the coat of arms of the city.
(noun)
a foundation or basis, a central part or principle of some system on which the other parts/principles depend;
e.g. Punctuality is the keystone of the train system's operations.
(noun)
a biological species, typically an animal or plant, that is essential to maintaining the ideal structure or function of its ecosystem;
e.g. This species is a keystone in its ecosystem, so we must protect it from becoming endangered.
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