noun (n)

• the amount of energy transmitted (as by acoustic or electromagnetic radiation)(noun.attribute)

  Example:
  He adjusted the intensity of the sound.
  

  Synonym:
  intensity level, strength
  

  source: wordnet30
• high level or degree; the property of being intense(noun.attribute)

  Synonym:
  intensiveness
  

  source: wordnet30
• the magnitude of sound (usually in a specified direction)(noun.attribute)

  Synonym:
  loudness, volume
  Antonym:
  softness
  

  source: wordnet30
• chromatic purity: freedom from dilution with white and hence vivid in hue(noun.attribute)

  Synonym:
  chroma, saturation, vividness
  

  source: wordnet30
• The state or quality of being intense; intenseness; extreme degree; as, intensity of heat, cold, mental application, passion, etc.(noun)

  source: webster1913