Word Challenge: Keystone

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Word of the day · May 18, 2026 Keystone 1. the central principle or part of a policy, system, etc., on which all else depends “cooperation remains the keystone of the government's security policy” noun/ˈkiˌstoʊn/

Choose the word that fits in the phrase “Education is the keystone of any society, serving as a ______ for its growth.” basis subsidiary

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