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WordNet (r) 3.0 (2006) (WordNet)

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