keystone

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.

On immigration, the keystone of Trump’s policy platform, he faced a number of setbacks.

From Los Angeles Times • Apr. 5, 2026

Morgan healthcare investor conference in San Francisco in mid-January, a keystone event at which companies often pre-announce guidance and earnings and roll out marquee acquisitions.

From Barron's • Dec. 28, 2025

Last year, some 1,000 U.S. troops withdrew from neighboring Niger, ending a nearly decadelong partnership that was the keystone of U.S. counterterrorism operations in the region.

From The Wall Street Journal • Nov. 2, 2025

The animals are regarded as "keystone" species which can create and maintain habitats for diverse other species.

From BBC • May 12, 2025

The keystone of the arch crashed almost on their heels, and the wall above crumbled, and fell in ruin.

From "The Return of the King" by J.R.R. Tolkien