cornerstone

noun cor·ner·stone \ ˈkȯr-nər-ˌstōn \
|Updated on: 17 Jul 2018

Definition of cornerstone

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

Recent Examples of cornerstone from the Web

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.

First Known Use of cornerstone

13th century

in the meaning defined at sense 1

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CORNERSTONE Defined for English Language Learners

cornerstone

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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