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Decibel (dB)1. A decibel (dB) is a unit of measurement of voltage or other intensity. Decibels are one tenth of a bel.

2. Abbreviation for DeciBels Adjusted, dBA is the noise power calculated in dB. 0 dBA is equal to 3.16 picowatts (-85 dBm).

3. A db is also sometimes used as an abbreviation for a database.

Also see: Measurement, Nepers, Power terms, Sound terms