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

1550–60; < Latin opācitās shade. See opaque, -ity

nonopacity, noun, plural nonopacities. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
opacity (əʊˈpæsɪtɪ)
n , pl -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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1560, "darkness of meaning, obscurity," from Fr. opacité, from L. opacitatem (nom. opacitas) "shade, shadiness," from opacus "shaded, dark, opaque." The lit. sense "condition of being impervious to light" first recorded 1634.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

opacity o·pac·i·ty (ō-pās'ĭ-tē)

  1. The quality or state of being opaque.

  2. An opaque or nontransparent area, as of the cornea.

The American Heritage® Stedman's Medical Dictionary
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