white noise

white noise

noun
1.
Also called white sound. a steady, unvarying, unobtrusive sound, as an electronically produced drone or the sound of rain, used to mask or obliterate unwanted sounds.
2.
Physics. random noise with a uniform frequency spectrum over a wide range of frequencies.

Origin:
1965–70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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White noise is always a great word to know.
So is fluidity. Does it mean:
the heat absorbed by a unit mass of a solid at its melting point that completely converts the solid to a liquid at the same temperature
the ability of a substance to flow; a measure of this ability, the reciprocal of the coefficient of viscosity
Collins
World English Dictionary
white noise
 
n
a.  sound or electrical noise that has a relatively wide continuous range of frequencies of uniform intensity
 b.  noise containing all frequencies rising in level by six decibels every octave

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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