cornerstone

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noun cor·ner·stone \ˈkȯr-nər-ˌstōn\

Definition of cornerstone

  1. 1 :  a stone forming a part of a corner or angle in a wall; specifically :  such a stone laid at a formal ceremony

  2. 2 :  a basic element :  foundation a cornerstone of foreign policy

Examples of cornerstone in a Sentence

  1. Officials held a ceremony to lay the cornerstone for a new library.

  2. Trust is the cornerstone of their relationship.

13th Century

First Known Use of cornerstone

13th century

Other Building Terms


CORNERSTONE Defined for English Language Learners

cornerstone

play
noun cor·ner·stone \ˈkȯr-nər-ˌstōn\

Definition of cornerstone for English Language Learners

  • : 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



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