cor·​ner·​stone | \ ˈkȯr-nər-ˌstōn How to pronounce cornerstone (audio) \

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

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Examples of cornerstone in a Sentence

Officials held a ceremony to lay the cornerstone for a new library. Trust is the cornerstone of their relationship.
Recent Examples on the Web Randle was a cornerstone of the community known for her activism and spirit. Claire Goodman, Houston Chronicle, "‘She was, is, and always will be a Fulshear icon’: Former Fulshear mayor Viola Randle dies at age 96," 16 Sep. 2020 The bar has been a cornerstone of American culture from the very beginning. Jon Taffer, Fortune, "Bar Rescue: Pandemic Edition," 15 Sep. 2020 Part of the festivities included the opening of a time capsule from 1965 that was placed on a cornerstone of the current building, 37711 Detroit Road. cleveland, "Avon city-wide scavenger hunt sweepstakes features duct tape sculptures: Short Takes on Avon, Avon Lake and North Ridgeville," 12 Sep. 2020 College football also has been a cornerstone of my journalism career, from my early beats covering the University of Florida and University of Miami to reporting on a dozen or so national championship games. Christine Brennan, USA TODAY, "Opinion: I love college football but just can’t watch amid COVID-19 concerns?," 12 Sep. 2020 Ramsey is now officially a cornerstone of the Rams' revamped defense alongside Donald, who has a six-year, $135 million contract through 2024. Greg Beacham, Star Tribune, "Corner lockdown: Ramsey gets 5 years, $105 million from Rams," 9 Sep. 2020 Frequent testing has been a cornerstone of federal and state plans to fight the virus in nursing homes, where many of the residents possess the underlying health conditions that make the virus more deadly. Faimon Roberts,, "Rapid coronavirus testing is now at Louisiana nursing homes. What does this mean for visitations?," 4 Sep. 2020 Pitman Hughes and Steinem became friends during the feminist movement in the U.S. and their friendship is a cornerstone in the film. Alexia Fernandez,, "First Look! Julianne Moore and Janelle Monáe Channel Feminist Icons in The Glorias," 2 Sep. 2020 Focusing on larger luxury cars in the shift toward electric vehicles is a cornerstone of Kallenius’ strategy to revive margins at Mercedes. Matthew Miller,, "Mercedes Draws Up Electric Maybach to Defend Luxury Position," 1 Sep. 2020

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.

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First Known Use of cornerstone

13th century, in the meaning defined at sense 1

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Time Traveler for cornerstone

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The first known use of cornerstone was in the 13th century

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Statistics for cornerstone

Last Updated

22 Sep 2020

Cite this Entry

“Cornerstone.” Dictionary, Merriam-Webster, Accessed 29 Sep. 2020.

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More Definitions for cornerstone


How to pronounce cornerstone (audio)

English Language Learners Definition of cornerstone

: 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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