AskDefine | Define keystone

Dictionary Definition



1 a central cohesive source of support and stability; "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm" [syn: anchor, mainstay, backbone, linchpin, lynchpin]
2 the central building block at the top of an arch or vault [syn: key, headstone]

User Contributed Dictionary



  • /ˈkiː.stəʊn/, /"


  1. The top stone of an arch.


Extensive Definition

Keystone may refer to:




* The "Keystone State", nickname for the U.S. Commonwealth of Pennsylvania, in use by 1802



Other uses

keystone in German: Keystone
keystone in Dutch: Keystone
keystone in Polish: Keystone
keystone in Volapük: Keystone

Synonyms, Antonyms and Related Words

apse, arcade, arcature, arch, arched roof, archway, basis, bench mark, camber, cardinal point, ceilinged roof, chief thing, climax, concameration, concha, core, cornerstone, cove, crisis, critical point, crux, cupola, dome, essence, essential, essential matter, first stone, footstone, foundation, foundation stone, fundamental, geodesic dome, gist, gravamen, great point, headstone, heart, high point, igloo, important thing, issue, kernel, landmark, main point, main thing, material point, meat, milestone, necessity, nub, ogive, pith, pivot, principle, quoin, real issue, salient point, sine qua non, skewback, span, substance, substantive point, the bottom line, the point, turning point, vault, vaulting, voussoir
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