noun, plural o·pac·i·ties.

  1. the state or quality of being opaque.
  2. something opaque.
  3. the degree to which a substance is opaque; capacity for being opaque.
  4. Photography. the proportion of the light that is absorbed by the emulsion on any given area of a film or plate.
  5. obscurity of meaning.
  6. mental dullness.
  7. Medicine/Medical. an opaque spot or area in normally clear or transparent tissue, as a cataract of the eye.

noun plural -ties

  1. the state or quality of being opaque
  2. the degree to which something is opaque
  3. an opaque object or substance
  4. obscurity of meaning; unintelligibility
  5. physics photog the ratio of the intensity of light incident on a medium, such as a photographic film, to that transmitted through the medium
  6. logic philosophy the property of being an opaque context

n.1550s, “darkness of meaning, obscurity,” from French opacité, from Latin opacitatem (nominative opacitas) “shade, shadiness,” from opacus “shaded, dark, opaque” (see opaque). The literal sense “condition of being impervious to light” first recorded 1630s. n.

  1. The quality or state of being opaque.
  2. An opaque or nontransparent area, as of the cornea.

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