cornerstone Meaning and Definition
1. n. a stone at the outer corner of two intersecting masonry walls
2. n. a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies
3. n. the fundamental assumptions from which something is begun or developed or calculated or explained
The cornerstone (or foundation stone) concept is derived from the first stone set in the construction of a masonry foundation, important since all other stones will be set in reference to this stone, thus determining the position of the entire structure.
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