Longman Dictionary of Contemporary English homepage

cornerstone

 noun
     
Related topics: Buildings
cor‧ner‧stone [countable]
1 something that is extremely important because everything else depends on it
cornerstone of
The magazine became the cornerstone of McFadden's publishing empire.
2TBB a stone at one of the bottom corners of a building, often put in place at a special ceremony [= foundation stone]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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