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Definitions

cornerstone

[kawr-ner-stohn] / ˈkɔr nərˌstoʊn /


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The consensus among scholars and practitioners in design is nearly unanimous: Usability is one of the cornerstone achievements of our society over the past century.

From Slate • Apr. 4, 2026

Exxon made algae the cornerstone of its clean-energy initiatives for years and pressed on even after a lack of progress led other big oil companies to abandon similar research.

From The Wall Street Journal • Mar. 31, 2026

"It is a cornerstone of Iran's economy and a major source of revenue for the Iranian Revolutionary Guards," JP Morgan added, referring to Iran's well-resourced ideological army which has major economic interests.

From Barron's • Mar. 14, 2026

Described as “a cornerstone of the Shade 45 family,” Sear had been involved with the SiruisXM hip-hop station created by Eminem since its inception in 2004.

From Los Angeles Times • Mar. 12, 2026

Roosevelt was also known as the guardian of America’s land—a cornerstone of his presidency that was influenced by his time spent in the Wild West.

From "Death on the River of Doubt" by Samantha Seiple