opacity

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opac|ity /oʊp'æsɪti/
1 [N-UNCOUNT]
Opacity is the quality of being difficult to see through. (FORMAL)
Opacity of the eye lens can be induced by deficiency of certain vitamins...
2 [N-UNCOUNT]
If you refer to something's opacity, you mean that it is difficult to understand. (FORMAL)
Its dramatic nuances were often generalised to the point of opacity.
= obscurity
≠ transparency

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