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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

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"keystone." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"keystone." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/keystone-0

"keystone." The Oxford Pocket Dictionary of Current English. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/keystone-0

keystone

keystone. Wedge-shaped key-block at the crown of an arch to consolidate a structure.

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"keystone." A Dictionary of Architecture and Landscape Architecture. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"keystone." A Dictionary of Architecture and Landscape Architecture. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/keystone

"keystone." A Dictionary of Architecture and Landscape Architecture. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/keystone

keystone

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"keystone." Oxford Dictionary of Rhymes. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"keystone." Oxford Dictionary of Rhymes. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/keystone

"keystone." Oxford Dictionary of Rhymes. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/keystone