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Noun: opacity  ow'pa-su-tee [N. Amer], ow'pa-su-tee or u'pa-su-tee [Brit]
  1. The phenomenon of not permitting the passage of electromagnetic radiation
     
  2. Incomprehensibility resulting from obscurity of meaning
    - opaqueness
     
  3. The quality of being opaque to a degree; the degree to which something reduces the passage of light
    - opaqueness

Derived forms: opacities

See also: opaque

Type of: incomprehensibility, physical phenomenon, quality

Antonym: clarity, transparency

Encyclopedia: Opacity