or '''opaque''' refers to something difficult to see through or perceive. It can refer to:
- Opacity (optics) , 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
- "opaque" is a special flag on many Unix Filesystems Source? -->
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