In acoustics (as opposed to paper towels), the opposite of reflection. Sound waves are “absorbed” or soaked up by soft materials they encounter. Studio designers put this fact to work to control the problem of reflections coming back to the engineer’s ear and interfering with the primary audio coming from the monitors. The absorptive capabilities of various materials are rated with an “Absorption Coefficient,” which is a measure of the relative amount of sound energy absorbed by that material when a sound strikes its surface. (See also WFTD “Anechoic“)