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  1. KEYSTONE Definition & Meaning - Merriam-Webster

    The meaning of KEYSTONE is the wedge-shaped piece at the crown of an arch that locks the other pieces in place. How to use keystone in a sentence.

  2. KEYSTONE | English meaning - Cambridge Dictionary

    KEYSTONE definition: 1. the middle stone in the top of an arch that has a special shape and holds all the other stones…. Learn more.

  3. Keystone: Definition, Meaning, and Examples

    Dec 8, 2024 · Keystone (noun): The central principle or part of a policy, system, etc., on which all else depends. The word "keystone" primarily refers to the central, wedge-shaped stone at the …

  4. keystone noun - Definition, pictures, pronunciation and usage ...

    Definition of keystone noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

  5. Keystone - definition of keystone by The Free Dictionary

    key•stone (ˈkiˌstoʊn) n. 1. the wedge-shaped piece at the summit of an arch, regarded as holding the other pieces in place. 2. something on which associated things depend; foundation. …

  6. keystone, n.¹ & adj. meanings, etymology and more | Oxford ...

    There are eight meanings listed in OED's entry for the word keystone, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

  7. KEYSTONE Definition & Meaning | Dictionary.com

    KEYSTONE definition: the wedge-shaped piece at the summit of an arch, regarded as holding the other pieces in place. See examples of keystone used in a sentence.