from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A stone at the corner of a building uniting two intersecting walls; a quoin.
  • n. Such a stone, often inscribed, laid at a ceremony marking the origin of a building.
  • n. An indispensable and fundamental basis: the cornerstone of an argument.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A ceremonial stone set at the corner of a building, joining two exterior walls, and often inscribed with the starting and completion dates of construction, the name of the architect and owner, and other details.
  • n. By extension, that which is prominent, fundamental, noteworthy, or central.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a stone at the outer corner of two intersecting masonry walls
  • n. the fundamental assumptions from which something is begun or developed or calculated or explained
  • n. a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies


Sorry, no etymologies found.


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  • "Safeguarding the livelihood of the people should be the ruling party's long-term cornerstone," Mr. Bo said in a speech late last month.

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