- quality or fact or degree of being audible or perceptible by the ear
- The quality of being heard or understood; the degree to which a thing is audible
- The range of sound-wave frequencies that can be heard by humans: 30 to 20,000 Hz.
- Ability to be heard; said of faint sounds in the presence of noise. The extreme range of audibility is 20-20,000 Hz in frequency, depending on the applied intensity; and from 2 x 10^-5Nm^-2(ms) at 1000 Hz (the zero of the phon scale, selected as the average for good ears) to 120 dB.
- The measure of the severity of a sonic imperfection. The scale of audibility, from least audible to most audible, is: inaudible, subtle, slight, moderate, obvious, conspicuous, and Arrggh!!