There are 2 main definitions of bel in English:

bel1

Line breaks: bel
Pronunciation: /bɛl
 
/

noun

A unit used in the comparison of power levels in electrical communication or of intensities of sound, corresponding to an intensity ratio of 10 to 1. See also decibel.
More example sentences
  • The drives are rated at under 2.5 bels of acoustic power, the same level of acoustic noise produced by Seagate's PC drives.
  • Select a heat pump with an outdoor sound rating of 7.6 bels or lower.
  • The present invention is a computer chassis assembly that can adequately cool an electronic system which generates 450 watts of heat, without emitting cooling fan noise above 5 bels of sound power.

Origin

1920s: from the name of A. G. Bell (see Bell, Alexander Graham).

Definition of bel in: