1. (noun) basis, base, foundation, fundament, groundwork, cornerstone
the fundamental assumptions from which something is begun or developed or calculated or explained
Synonyms: bottom, foundation garment, founding, tail, groundwork, al-Qaida, instauration, butt, pedestal, substructure, posterior, rear end, introduction, can, nates, al-Qaeda, theme, stern, basis, innovation, fundament, nucleotide, foundation, buttocks, prat, radical, root, floor, ground, seat, backside, bum, tooshie, grounding, buns, arse, foot, hindquarters, footing, tail end, behind, origination, understructure, alkali, cornerstone, base, hind end, derriere, rump, ass, home, keister, stem, base of operations, radix, root word, stand, rear, fanny, infrastructure, tush, institution, initiation, al-Qa'ida, creation, bag
2. (noun) cornerstone
a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies
Synonyms: foundation, base, groundwork, fundament, basis
3. (noun) cornerstone
a stone at the outer corner of two intersecting masonry walls
Synonyms: foundation, base, groundwork, fundament, basis
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Synonyms for cornerstone 
