keystone
key·stone / ˈkēˌstōn/ • n. a central stone at the summit of an arch, locking the whole together. ∎ [usu. in sing.] the central principle or part of a policy, system, etc., on which all else depends: cooperation remains the keystone of the government's security policy.
keystone
keystone. Wedge-shaped key-block at the crown of an arch to consolidate a structure.
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keystone