1. cornerstone - noun
· the fundamental assumptions from which something is begun or developed or calculated or explained; "the whole argument rested on a basis of conjecture"
Synonym(s): basis, base, foundation, fundament, groundwork
Hypernym(s): assumption, supposition, supposal
2. cornerstone - noun
· a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies
Hypernym(s): stone
3. cornerstone - noun
· a stone at the outer corner of two intersecting masonry walls
Hypernym(s): stone
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