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nonvolatile

[non-vol-uh-tl, -til or, esp. British, -tahyl]
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adjective
  1. not volatile.
  2. (of computer memory) having the property of retaining data when electrical power fails or is turned off.
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Origin of nonvolatile

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for non-volatile

adj.

also nonvolatile, 1837, from non- + volatile.

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Online Etymology Dictionary, © 2010 Douglas Harper