Definition of cornerstone
English to English noun - the fundamental assumptions from which something is begun or developed or calculated or explained
The whole argument rested on a basis of conjecture.
source: WordNet 3.0 - a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies
source: WordNet 3.0 - a stone at the outer corner of two intersecting masonry walls
source: WordNet 3.0
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