Dictionary.com
Thesaurus.com

nonvolatile

American  
[non-vol-uh-tl, -til, -tahyl] / nɒnˈvɒl ə tl, -tɪl, -ˌtaɪl /

adjective

  1. not volatile.

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


Etymology

Origin of nonvolatile

non- + volatile