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- Dictionaryopacity/ə(ʊ)ˈpasɪti/
noun
- 1. the quality of lacking transparency or translucence: "thinner paints need black added to increase opacity" Similar Opposite
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noun
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Opacity is the measure of impenetrability to electromagnetic or other kinds of radiation, especially visible light. In radiative transfer, it describes the absorption and scattering of radiation in a medium, such as a plasma, dielectric, shielding material, glass, etc. An opaque object is neither transparent (allowing all light to pass through) nor translucent (allowing some light to pass through)... Wikipedia