(redirected from Not rated)
Also found in: Dictionary, Medical, Financial, Acronyms.



noise reduction, NR

The difference in decibels between the average sound pressure levels produced in two rooms by a sound source in one of them.


The country code for Nauru.
References in periodicals archive ?
TIG Insurance Company of Texas Not Rated 'A' (Single-A)
The classes L-B-1 through L-B-6 are not rated by Fitch.
Classes K-LH, X-LHK, L-LH, X-LHL, M-LH, X-LHM, N-LH, and X-LHN are not rated by Fitch.
The classes 1-B-1 through 1-B-6 certificates are not rated by Fitch.