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English definition of “cornerstone”

cornerstone

noun [C]     /ˈkɔː.nə.stəʊn/ US  /ˈkɔːr.nɚ.stoʊn/
a stone in a corner of a building, especially one with the date when the building was made or other writing on itWalls and parts of walls something of great importance that everything else depends on: In most countries, the family unit is still the cornerstone of society.Walls and parts of wallsImportanceUseful or advantageous
(Definition of cornerstone noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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