WordReference Random House Learner's Dictionary of American English © 2015
dec•i•bel /ˈdɛsəˌbɛl, -bəl/USA pronunciation n. [countable]

    Physicsa unit that is used to express differences in power, esp. in measuring the loudness of sound. Abbr.: dBdb

Collins Concise English Dictionary © HarperCollins Publishers::

decibel /ˈdɛsɪˌbɛl/ n
  1. a unit for comparing two currents, voltages, or power levels, equal to one tenth of a bel
  2. a similar unit for measuring the intensity of a sound. It is equal to ten times the logarithm to the base ten of the ratio of the intensity of the sound to be measured to the intensity of some reference sound, usually the lowest audible note of the same frequency

Abbreviation: dB

'decibel' also found in these entries:
dB - PNdB

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