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