cornerstone noun - Definition, pictures, pronunciation and usage …
https://www.oxfordlearnersdictionaries.com/us/definition/english/cornerstone
WEBthe most important part of something that the rest depends on. This study is the cornerstone of the whole research programme. Definition of cornerstone noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
DA: 52 PA: 37 MOZ Rank: 91