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keystone

noun

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as in cornerstone
an immaterial thing upon which something else rests a sense of history is the keystone to the city's draw as a tourist destination

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keystone

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“Keystone.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/keystone. Accessed 1 Dec. 2022.

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Nglish: Translation of keystone for Spanish Speakers

Britannica.com: Encyclopedia article about keystone

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