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Noun: cornerstone  'kor-nu(r),stown
  1. The fundamental assumptions from which something is begun, developed, calculated or explained
    "the whole argument rested on a cornerstone of conjecture";
    - basis, base, foundation, fundament, groundwork
  2. A stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies
  3. A stone at the outer corner of two intersecting masonry walls

Derived forms: cornerstones

Type of: assumption, stone, supposal, supposition

Part of: building, edifice, explanation

Encyclopedia: Cornerstone, Pennsylvania