Definition of cornerstone
- a cornerstone of foreign policy
Officials held a ceremony to lay the cornerstone for a new library.
Trust is the cornerstone of their relationship.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cornerstone.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
: a stone that forms part of a corner in the outside wall of a building and that often shows the date when the building was built
: something of basic importance
See words that rhyme with cornerstone Thesaurus: All synonyms and antonyms for cornerstone Spanish Central: Translation of cornerstone Nglish: Translation of cornerstone for Spanish speakers Britannica English: Translation of cornerstone for Arabic speakers Britannica.com: Encyclopedia article about cornerstone
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