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neper

[ nee-per, ney- ]
/ ˈni pər, ˈneɪ- /
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noun Physics.

the unit used to express the ratio of two amplitudes as a natural logarithm: equal to 8.68 dB. Abbreviation: Np

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Also na·pi·er [ney-pee-er] /ˈneɪ pi ər/ .

Origin of neper

First recorded in 1920–25; after J. Neper; see John Napier
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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British Dictionary definitions for neper

neper
/ (ˈneɪpə, ˈniː-) /

noun

a unit expressing the ratio of two quantities, esp amplitudes in telecommunications, equal to the natural logarithm of the ratio of the two quantitiesSymbol: Np, N

Word Origin for neper

C20: named after John Napier; the name was approved in 1928
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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