intensity

noun

1. 1

   chromatic purity: freedom from dilution with white and hence vivid in hue

2. 2

   the magnitude of sound (usually in a specified direction)

   the kids played their music at full volume

3. 3

   high level or degree; the property of being intense

4. 4

   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