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fundament (n.)

late 13c., "foundation, base; buttocks, anus," from Old French fondement "foundation, bottom; land, estate; anus" (12c.), from Latin fundamentum "a foundation, ground-work; support; beginning," from fundare "to found" (see bottom (n.)). So called because it is where one sits.

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Definitions of fundament from WordNet

fundament (n.)
the fundamental assumptions from which something is begun or developed or calculated or explained;
fundament (n.)
the fleshy part of the human body that you sit on;
Synonyms: buttocks / nates / arse / butt / backside / bum / buns / can / hindquarters / hind end / keister / posterior / prat / rear / rear end / rump / stern / seat / tail / tail end / tooshie / tush / bottom / behind / derriere / fanny / ass
fundament (n.)
lowest support of a structure;
Synonyms: foundation / base / foot / groundwork / substructure / understructure
From wordnet.princeton.edu