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fundament
noun
1.
the fundamental assumptions from which something is begun or developed or calculated or explained
forehedging
underroot
base
basis
cornerstone
foundation
groundwork
2.
the fleshy part of the human body that you sit on
hinder
hinderling
po-po
thang
arse
ass
backside
behind
bottom
bum
buns
butt
buttocks
can
derriere
fanny
hind end
hindquarters
keister
nates
posterior
prat
rear
rear end
rump
seat
stern
tail
tail end
tooshie
tush
3.
lowest support of a structure
basing
ginth
groundlaying
groundwall
hernstone
lyeshaft
rock bottom holdout
stifting
underpinning
warp and woof
base
foot
foundation
groundwork
substructure
understructure