### noun

**(1) **A logarithmic unit of sound intensity; 10 times the logarithm of the ratio of the sound intensity to some reference intensity

### Noun

- a common measure of sound intensity that is 1 tenth of a bel on the logarithmic intensity scale. It is defined as dB = 10 * log
_{10}(P _{1}/P _{2}), where P_{1} and P_{2} are the relative powers of the sound.