Search Result for "cornerstone": 
Wordnet 3.0

NOUN (3)

1. the fundamental assumptions from which something is begun or developed or calculated or explained;
- Example: "the whole argument rested on a basis of conjecture"
[syn: 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;

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2 definitions retrieved:

WordNet (r) 3.0 (2006):

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" [syn: 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
Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "cornerstone": bench mark, cardinal point, chief thing, climax, core, crisis, critical point, crux, essence, essential, essential matter, first stone, footstone, foundation stone, fundamental, gist, gravamen, great point, headstone, heart, high point, important thing, issue, kernel, keystone, landmark, main point, main thing, material point, meat, milestone, nub, pith, pivot, quoin, real issue, salient point, sine qua non, substance, substantive point, the bottom line, the point, turning point