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Definition of cornerstone


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cor·ner·stone also corner stone  audio  (kôrnr-stn) KEY 

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



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