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Definition of 'cornerstone'

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  1. the fundamental assumptions from which something is begun or developed or calculated or explained; "the whole argument rested on a basis of conjecture"
       Synonyms: 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

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