Word of the Day "Keystone"
Manage episode 342196009 series 2813070
Keystone [KEE-stohn]
Part of speech: noun
Origin: English, 17th century
1. A central stone at the summit of an arch, locking the whole together.
2. The central principle or part of a policy, system, etc., on which all else depends.
Examples of Keystone in a sentence
"The last year’s monthly profits were the keystone of the CEO’s argument for a new sales approach."
"The health of some species, such as elephants, is considered the keystone of an entire ecosystem."
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