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See also: Keystone



key +‎ stone

Definition 4 (retail) perhaps originated in the jewelry industry in the magazine called "Jewelers' Circular-Keystone" Source:



keystone (plural keystones)

  1. (architecture) The top stone of an arch.
  2. Something on which other things depend for support.
    • 1999, Eliezer Geisler, Methodology, Theory, and Knowledge in the Managerial and Organizational ...[1]:
      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 native or resident of the American state of Pennsylvania.
  4. (retail) A retail price that is double the cost price; a markup of 100%.
  5. (baseball) The combination of the shortstop and second baseman.

Derived terms[edit]



keystone (third-person singular simple present keystones, present participle keystoning, simple past and past participle 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, retail) To double the cost price in order to determine the retail price; to apply a markup of 100%.