Opaque

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Opacity or opaque refers to something difficult to see through or perceive. It can refer to:

• Opacity (optics), the degree to which light is blocked.
• Opaque context, a linguistic context in which it is not possible to substitute co-referential terms while guaranteeing the preservation of truth values.
• Opaque data, in computer programming, data that can only be manipulated through an external interface, see magic cookie

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