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Cornerstone

ˈkɔːnəstəʊn

Cornerstone definitions

noun

Inflections:

cornerstone cornerstones

an important quality or feature on which a particular thing depends or is based

"a national minimum wage remained the cornerstone of policy"

Synonyms:
foundation basis keystone mainspring mainstay linchpin bedrock fundament base key fundamental principle main ingredient central component centrepiece core heart centre focus crux prop backbone anchor
a stone that forms the base of a corner of a building, joining two walls