volume unit

American  

noun

1. a logarithmic unit used to measure the magnitude of a sound wave.

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Etymology

Origin of volume unit

First recorded in 1935–40

Example Sentences

Each variable air volume unit then adjusts the air flow for its specific zone.

From Scientific American

This isn’t exactly a definitive statement, but if Dell wants to tap into this volume unit opportunity that I believe will be larger than notebooks, they need to do something here.

From Forbes