American English

Definition of cornerstone noun from the Oxford Advanced American Dictionary

     

    cornerstone

     noun
    noun
    NAmE//ˈkɔrnərˌstoʊn//
     
     
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  1. 1 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 program.
See the Oxford Advanced Learner's Dictionary entry: cornerstone