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keystone

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keystone/ˈkiːˌstoʊn/noun
pluralkeystones
keystone
/ˈkiːˌstoʊn/
noun
pluralkeystones
Learner's definition of KEYSTONE  
[count]
: a large stone at the top of an arch that locks the other stones in place
: something on which other things depend for support
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