Etymology
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white noise (n.)

"sound made up of a random mixture of frequencies and intensities," by 1970, from white (adj.) + noise (n.).

updated on April 02, 2014

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Definitions of white noise from WordNet

white noise (n.)
a noise produced by a stimulus containing all of the audible frequencies of vibration;
white noise is a good masking agent
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.