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WordNet (r) 3.0 (2006) (WordNet)

fundament
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: the fleshy part of the human body that you sit on; "he
deserves a good kick in the butt"; "are you going to sit on
your fanny and do nothing?" [synonym: {buttocks}, {nates},
{arse}, {butt}, {backside}, {bum}, {buns}, {can},
{fundament}, {hindquarters}, {hind end}, {keister},
{posterior}, {prat}, {rear}, {rear end}, {rump}, {stern},
{seat}, {tail}, {tail end}, {tooshie}, {tush}, {bottom},
{behind}, {derriere}, {fanny}, {ass}]
3: lowest support of a structure; "it was built on a base of
solid rock"; "he stood at the foot of the tower" [synonym:
{foundation}, {base}, {fundament}, {foot}, {groundwork},
{substructure}, {understructure}]