keystone

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keystone¹

  • /ˈkiː.stəʊn/

Rhymes with -iːstəʊn

Where it comes from

From key + stone.

Definition 4 (retail) possibly originated in the jewelry industry in the magazine called "Jewelers' Circular-Keystone".

noun keystones

  1. The top stone of an arch. The tunnel, which is 1,000 yd. long, had been closed to passenger traffic since November 17, 1949, after some of the keystones had worked loose.
  2. Something on which other things depend for support. Tension between empirical and theoretical knowledge is keystone to sociological and to organizational theories, as early as in Marx's and Weber's frameworks.
  3. A retail price that is double the cost price; a markup of 100%.
  4. The combination of the shortstop and second baseman.

verb keystones · keystoning · keystoned

  1. transitive To distort (an image) by projecting it onto a surface at an angle, which for example causes a square to look like a trapezoid.
  2. transitive To double the cost price in order to determine the retail price; to apply a markup of 100%.

Keystone²

proper noun

  1. A census-designated place in Colorado.
  2. A city and town in Iowa.
  3. A ghost town in North Dakota.
  4. A town in South Dakota.

Thesaurus

Closest in meaning: headstone, vault, pillar, cornerstone, basement, centrepiece, key, fulcrum, pivot, linchpin, lynchpin, touchstone, milestone, bedrock, angular, centerpiece

Translations

Every language

noun the top stone of an arch

Españolclave, dovela
한국어쐐기돌 sswaegidol
日本語キーストーン
Portuguêspedra angular
Françaisclef de voûte, clé de voute, clef d'arc, clé d'arc, claveau
DeutschSchlussstein, Scheitelstein
Italianochiave di volta
Ελληνικάσφηνόλιθος sfinólithos
Românăcheie de boltă
Русскийзамко́вый ка́мень zamkóvyj kámenʹ, замо́к zamók
العربيةحجر العقد
עבריתאבן הראשה

noun something on which other things depend for support

Françaisclef de voûte
Русскийзамко́вый ка́мень zamkóvyj kámenʹ
Tiếng Việtrường cột

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Cite this
MLA

"keystone." Wiktionary, via Micwyn, micwyn.com/word/keystone. Accessed 6 Nov. 2026.

APA

keystone. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/keystone

Chicago

"keystone." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/keystone.

BibTeX
@misc{keystone_2026,
  title = {keystone},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/keystone},
  urldate = {2026-11-06}
}