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# decibel

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noun deci·bel \ˈde-sə-ˌbel, -bəl\

## Simple Definition of decibel

• : a unit for measuring how loud a sound is

Source: Merriam-Webster's Learner's Dictionary

## Full Definition of decibel

1. 1 a :  a unit for expressing the ratio of two amounts of electric or acoustic signal power equal to 10 times the common logarithm of this ratio b :  a unit for expressing the ratio of the magnitudes of two electric voltages or currents or analogous acoustic quantities equal to 20 times the common logarithm of the voltage or current ratio

2. 2 :  a unit for expressing the relative intensity of sounds on a scale from zero for the average least perceptible sound to about 130 for the average pain level

3. 3 :  degree of loudness; also :  extremely loud sound —usually used in plural

## Examples of decibel in a sentence

1. a rock concert blasting music at 110 decibels

2. <the crowd decibels increased dramatically as the horses neared the finish line>

## Did You Know?

The unit for measuring the relative intensities of sound is called a decibel. Because the decibel scale is logarithmic, a sound with an intensity that is twice that of a reference sound corresponds to an increase of little more than 3 decibels. In common practice, the reference point of 0 decibel is set at the intensity of the least perceptible sound, the threshold of hearing. On such a scale a 10-decibel sound is 10 times the intensity of the reference sound; a 20-decibel sound is 100 times the reference intensity, and so on. Normal conversation is usually around 60 decibels, an electric saw around 100 decibels, and amplified rock music around 120 decibels.

## Origin and Etymology of decibel

International Scientific Vocabulary deci- + bel

First Known Use: 1928

## decibel

play
noun deci·bel \ˈde-sə-ˌbel, -bəl\

## Definition of decibel for Students

1. :  a unit for measuring the loudness of sounds

## decibel

play play
noun deci·bel \ˈdes-ə-bəl, -ˌbel\

## Medical Definition of decibel

1. 1a:  a unit for expressing the ratio of two amounts of electric or acoustic signal power equal to 10 times the common logarithm of this ratiob:  a unit for expressing the ratio of the magnitudes of two electric voltages or currents or analogous acoustic quantities equal to 20 times the common logarithm of the voltage or current ratio

2. 2:  a unit for expressing the relative intensity of sounds on a scale from zero for the average least perceptible sound to about 130 for the average pain level

## Seen and Heard

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#### peculiar

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different from the usual or normal

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