Definition of opacity noun from the Oxford Advanced Learner's Dictionary

     

    opacity

     noun
    noun
    BrE BrE//əʊˈpæsəti//
     
    ; NAmE NAmE//ˈpæsəti//
     
    [uncountable]
     
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  1. 1(specialist) the fact of being difficult to see through; the fact of being opaque sheets of frosted glass with varying degrees of opacity
  2. 2(formal) the fact of being difficult to understand; the fact of being opaque opposite transparency the opacity of the poet’s language
  3. Word Origin mid 16th cent.: from French opacité, from Latin opacitas, from opacus ‘darkened’.
See the Oxford Advanced American Dictionary entry: opacity