Từ điển trực tuyến - Online Dictionary

Advanced English Dictionary
+ noun
1 (especially AmE) a stone at the corner of the base of a building, often laid in a special ceremony
2 the most important part of sth that the rest depends on: This study is the cornerstone of the whole research programme.

Random quote: You must do the things you think you cannot do.: Eleanor Roosevelt

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Updated: 05/06/2018: List of Academic Words