cornerstone
1 ENTRIES FOUND:
plural
cornerstones
plural
cornerstones
Britannica Dictionary definition of CORNERSTONE
[count]
1
:
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
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Officials held a ceremony to lay the cornerstone for a new library.
2
:
something of basic importance
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Trust is the cornerstone of their relationship.
