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Noun
decibel
dB
Definition: a logarithmic unit of sound intensity; 10 times the logarithm of the ratio of the sound intensity to some reference intensity
Definition: A common measure of sound intensity ratio that is one tenth of a bel on the logarithmic intensity scale. It is defined as dB = 10 log₁₀(P₁ / P₂), where P₁ and P₂ are the relative powers of the sound.