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keystone
/ˈkiːstəʊn/
noun
1.
a central stone at the summit of an arch, locking the whole together.
Similar
cornerstone
central stone
quoin
▪
the central principle or part of a policy, system, etc., on which all else depends:
"cooperation remains the keystone of the government's security policy"
Similar
foundation
basis
linchpin
cornerstone
base
principle
guiding principle
core
heart
centre
crux
fundament
mainspring
priority
Scrabble Points: 15
K
5
E
1
Y
4
S
1
T
1
O
1
N
1
E
1
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