from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The varying difference, at a fixed point in a given medium, between the pressure caused by a sound wave and either atmospheric pressure or the average pressure of the medium.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the difference between the instantaneous pressure at a point in a sound field and the average pressure at that point
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