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cornerstone

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cornerstone/ˈkoɚnɚˌstoʊn/noun
pluralcornerstones
cornerstone
/ˈkoɚnɚˌstoʊn/
noun
pluralcornerstones
Learner's definition of CORNERSTONE  
[count]
: a stone that forms part of a corner in the outside wall of a building and that often shows the date when the building was built
: something of basic importance
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