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Definition of Decibel

Babylon English

unit of measurement for gauging the intensity of sound
Decibel Definition from Arts & Humanities Dictionaries & Glossaries
Glossary of Technical Theatre Terms
Relative measurement for the volume (loudness) of sound. Also used to measure the difference between two voltages, or two currents. See Zero dB.
Jon Primrose
Decibel Definition from Science & Technology Dictionaries & Glossaries
Telecommunication Standard Terms
See dB.
RF Electronics
A ratio of two levels, based upon a logarithmic scale. Often abbreviated as dB.
A decibel is a logarithmic unit used to describe signal ratios.
Technical English by wpv
A unit (dB) for measuring the relative strength of signal power. The number of decibels equals ten times the logarithm (base 10) of the ration of the measured signal power to a reference power. One tenth of a bell.
A decibel is a division of a logarithmic scale for expressing the ratio of two quantities proportional to power or energy. The number of decibels denoting such a ratio is ten times the logarithm of the
Fiber Optics, Optical Networking Terms
A unit of measurement indicating relative optic power on a logarithmic scale. Often expressed in reference to a fixed value, such as dBm (1 milliwatt) or dBA (1 microwatt).
Decibel Definition from Computer & Internet Dictionaries & Glossaries
Digital Video (DV) & video edit terms / Eng2Eng v1.0 (web compilation)
A unit of measure applied to both sound and electrical signals, based on a logarithmic scale. Also referred to as "db's."
The standard unit for measuring sound. A subjective scale where one unit equals one increment of “loudness.”
Electronic Music Glossary
A reference for the measurement of sound energy. The minimum change in volume that the human ear can perceive. Named after Alexander Graham Bell. A decibel is 1/10th of a Bel.
Glossary of Electronic Music Terms
A unit of measurement used to indicate audio power level. Technically, a decibel is a logarithmic ratio of two numbers, which means that there is no such thing as a dB measurement of a single signal. In order to measure a signal in dB, you need to know what level it is referenced to. Commonly used reference levels are indicated by such symbols as dBm, dBV, and dBu.
Pablo Aguilar
Video Essentials Glossary of Terms
The standard unit used to express gain or loss of power along a signal path. It indicates the logarithmic ratio of output power divided by input power. A power loss of 3 dB is an attenuation of the incoming signal by half of its original value. A 3 dB power loss is equal to a 6 dB voltage loss. [dB = 10 log P1/P2, P = V¨/R, If R is a fixed value, then: dB = 10 log (V1/V2)¨ or dB = 20 log V1/V2. ] This method of scaling levels becomes important because human sensitivity to sight and sound are logarithmic, which accounts for our large dynamic range capability.
Sound Escape Glossary of Terms
The standard unit of measuring differnces in the expression of relative power or amplitude. One dB is the smallest change in loudness most people can detect. A 1 dB difference is barely noticeable, while 10 dB higher volume will sound twice as loud. Each 3 dB increase in volume level requires double the amplifier power.
Decibel Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
The decibel (dB) is a logarithmic unit used to express the ratio between two values of a physical quantity (usually measured in units of power or intensity). One of these quantities is often a reference value, and in this case the dB can be used to express the absolute level of the physical quantity. The decibel is also commonly used as a measure of gain or attenuation, the ratio of input and output powers of a system, or of individual factors that contribute to such ratios. The number of decibels is ten times the logarithm to base 10 of the ratio of the two power quantities. A decibel is one tenth of a bel, a seldom-used unit named in honor of Alexander Graham Bell.

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Decibel Definition from Society & Culture Dictionaries & Glossaries
Environmental Engineering (English ver.)
  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 level at which sound causes pain to humans.
Decibel Definition from Entertainment & Music Dictionaries & Glossaries
Guitar Glossary
The unit of measurement of audio level. Ten times the logarithm of the ratio of two power levels. Twenty times the logarithm of the ratio of two voltages. Standard abbreviations using decibels include: dBV (decibels relative to 1 volt), dBu (decibels relative to 0.775 volt), dBm (decibels relative to 1 milliwatt) and dBA (decibels, A weighted).
Copyright © 1996-2006 Guitar Nine Records All Rights Reserved.
The DJ Glossary
A unit of measurement for expressing sound pressure level (SPL), signal level and variation or differences in signal level.
Stanton Magnetics
Decibel Definition from Medicine Dictionaries & Glossaries
Health Information
unit that measures the intensity or loudness of sound.
National Institute of Deafness and Other Communication Disorders
Decibel Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

Noun
1. a logarithmic unit of sound intensity; 10 times the logarithm of the ratio of the sound intensity to some reference intensity
(synonym) dB
(hypernym) sound unit