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- Dictionarycornerstone/ˈkɔːnəstəʊn/
noun
- 1. an important quality or feature on which a particular thing depends or is based: "a national minimum wage remained the cornerstone of policy"
- 2. a stone that forms the base of a corner of a building, joining two walls.
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CORNERSTONE definition: 1. a stone in a corner of a building, especially one with the date when the building was made or…. Learn more.
The meaning of CORNERSTONE is a stone forming a part of a corner or angle in a wall; specifically : such a stone laid at a formal ceremony. How to use cornerstone in a sentence.