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Wikipedia definition
1. LoudnessLoudness is the quality of a sound that is primarily a psychological correlate of physical strength. More formally, it is defined as "that attribute of auditory sensation in terms of which sounds can be ordered on a scale extending from quiet to loud. " Loudness, a subjective measure, is often confused with objective measures of sound strength such as sound pressure, sound pressure level, sound intensity or sound power.
Read “Loudness” on English Wikipedia
Read “音の大きさ” on Japanese Wikipedia
Read “Loudness” on DBpedia

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