Cornerstone Definition
 kôrnərstōn 
  cornerstones
  
    noun
  
 
    cornerstones
  
A stone at the corner of a building uniting two intersecting walls; a quoin.
 American Heritage 
A stone that forms part of the corner of a building; esp., a foundation stone of this kind, often inscribed, laid at a ceremony that marks the beginning of building.
 Webster's New World 
The basic, essential, or most important part; foundation.
 Webster's New World 
Other Word Forms of Cornerstone
Noun
Singular:
 cornerstonePlural:
 cornerstonesCornerstone Is Also Mentioned In
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