opacity Meaning, Definition & Usage

  1. noun the phenomenon of not permitting the passage of electromagnetic radiation
  2. noun incomprehensibility resulting from obscurity of meaning
    opaqueness.
  3. noun the quality of being opaque to a degree; the degree to which something reduces the passage of light
    opaqueness.

WordNet

O*pac"i*ty noun
Etymology
L. opacitas: cf.F. opacité.
Definitions
  1. The state of being opaque; the quality of a body which renders it impervious to the rays of light; want of transparency; opaqueness.
  2. Obscurity; want of clearness. Bp. Hall.

Webster 1913