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| cor·ner·stone [ káwrnər stn ] (plural cor·ner·stones) |
noun |
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| Definition: |
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1. vital person or thing: somebody or something fundamentally important
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2. stone at corner of two walls: a stone joining two walls where they meet at a corner
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3. first stone of new building: the first stone laid at a corner where two walls begin and form the first part of a new building
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