intensity

(n) the amount of energy transmitted (as by acoustic or electromagnetic radiation)
- he adjusted the intensity of the sound
- they measured the station's signal strength
intensity level, strength,
(n) high level or degree; the property of being intense intensiveness,
(n) the magnitude of sound (usually in a specified direction)
- the kids played their music at full volume
loudness, volume,
(n) chromatic purity: freedom from dilution with white and hence vivid in hue chroma, vividness, saturation,

intensity level strength intensiveness loudness volume chroma vividness saturation

softness

intensify intension intensive

intensity level