DICT.TW Dictionary Taiwan

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