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Podcast: The Jimmy Olsen Radio Network
Episode: Word of the Day "Keystone"
Description: Keystone [KEE-stohn] Â
Part of speech: noun
Origin: English, 17th century Â
1. A central stone at the summit of an arch, locking the whole together.Â
2. The central principle or part of a policy, system, etc., on which all else depends. Â
Examples of Keystone in a sentence Â
"The last year’s monthly profits were the keystone of the CEO’s argument for a new sales approach." Â
"The health of some species, such as elephants, is considered the keystone of an entire ecosystem."
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