Definition of cornerstone noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈkɔːnəstəʊn//
    ; NAmE NAmE//ˈkɔːrnərstoʊn//
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  1. 1(especially North American English) a stone at the corner of the base of a building, often laid in a special ceremony
  2. 2the most important part of something that the rest depends on This study is the cornerstone of the whole research programme.
See the Oxford Advanced American Dictionary entry: cornerstone