Definition of white noise
1 a : a heterogeneous mixture of sound waves extending over a wide frequency range — compare pink noise b : a constant background noise; especially : one that drowns out other sounds
2 : meaningless or distracting commotion, hubbub, or chatter <the white noise of policy and politics in America — Joseph Nocera>
Medical Definition of white noise
: a heterogeneous mixture of sound waves extending over a wide frequency range that has been used to mask out unwanted noise interfering with sleep—called also
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