cornerstone definition, meaning - what is cornerstone in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “cornerstone”

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cornerstone

noun [C] uk   /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 it something of great importance that everything else depends on: In most countries, the family unit is still the cornerstone of society.
(Definition of cornerstone from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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