Also found in: Thesaurus, Medical, Financial, Acronyms, Encyclopedia, Wikipedia.
(Units) a unit expressing the ratio of two quantities, esp amplitudes in telecommunications, equal to the natural logarithm of the ratio of the two quantities. Symbol: Np or N
[C20: named after John Napier; the name was approved in 1928]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014