#1
cornerstone n. [
basis, base, foundation, fundament, groundwork] the fundamental assumptions from which something is begun or developed or calculated or explained; "the whole argument rested on a basis of conjecture"
. wn #2
cornerstone n. a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies
. wn #3
cornerstone n. a stone at the outer corner of two intersecting masonry walls
. wn