nonvolatile

[non-vol-uh-tl, -til or, esp. British, -tahyl]
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adjective

(of computer memory) having the property of retaining data when electrical power fails or is turned off.

Origin of nonvolatile

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of nonvolatile