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.

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

They "play a central role in the food web, consuming fish and invertebrates and recycling nutrients" and are one of the "keystone species" of their ecosystem.

From Barron's • Oct. 10, 2025

Despite the pile-up of particulars, Metcalfe knows he must find the lost poem, that it is the keystone without which the story crumbles into insignificance.

From Los Angeles Times • Sep. 19, 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 state’s case was the six-page Plan of Action confiscated in the Rivonia raid.

From "Long Walk to Freedom" by Nelson Mandela