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What is a keystone?


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Keystone- 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: the keystone of one's philosophy. ChaCha on!

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The central building block at the top of an arch or vault. Thanks for using ChaCha for all your mobile information needs!

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A keystone is the central, topmost stone of an arch, popularly thought of as especially holding the others in place. ChaCha on!

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