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.

Proponents hailed lions as a keystone species that enhances biodiversity and pointed out the affection they generate — from Los Angeles’ late, famed P-22 to the lion that recently strolled through San Francisco.

From Los Angeles Times • Feb. 12, 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

I must set the keystone in the arch.

From "The Left Hand of Darkness" by Ursula K. Le Guin