Definition of "keystones" []

• Plural form of keystone. (noun)

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• "They're important "keystones," naturally, but as the altered timeline showed, the world will get along (albeit imperfectly) without them."
• "Rapids, Mich., in 1904, the railings and ornamental parts of the bridge, such as keystones, brackets, consols, dentiles and panels, were cast in molds and set in place much as cut stone would be."
• "The fab chief set out what he saw as the company's "keystones", including the firm's global nature, its drive towards innovation, collaboration within the IBM Alliance and "agility"."