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cornerstone
/ˈkoɚnɚˌstoʊn/
US
UK
noun
plural -stones
[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
Officials
held
a
ceremony
to
lay
the
cornerstone
for
a
new
library
.
something of basic importance
Trust
is
the
cornerstone
of
their
relationship
.
US