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Dictionary definition for: Cornerstone
1. (n) the fundamental assumptions from which something is begun or developed or calculated or explained; "the whole argument rested on a basis of conjecture"
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) a stone at the outer corner of two intersecting masonry walls
WordNet 2.1 Copyright Princeton University. All rights reserved.
