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    decibel

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    decibel
    dec‧i‧bel /ˈdesəbel, ˈdesɪbel, -bəl/ noun [countable] (written abbreviation dB)
     Date: 1900-2000
     Origin: deci- + bel unit of sound power (20-21 centuries), from Alexander Graham Bell (1847-1922), US inventor
    a unit for measuring the loudness of sound:
        noise levels exceeding 85 decibels