Opacity or opaque may refer to:
* Impediments to (especially, visible) light:
** Opacities,
absorption coefficients
**
Opacity (optics)
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, sh ...
, property or degree of blocking the transmission of light
* Metaphors derived from literal optics:
** In linguistics:
***
Opaque context, a term to describe the linguistic context of co-referential terms
***
Phonological opacity, a term in phonology
*** Semantic opacity, the opposite of
semantic transparency
**
Opaque travel inventory, the market of selling unsold travel inventory at a discounted price
* Musical works:
**
''Opacity'' (album)
**
Opacities (EP)
* Computer science:
** Measure of obscuration of background by "painting" an image, e.g.
alpha channel
** Use of an
opaque data type
** Property attributed to data that can be interpreted only by using an external entity, e.g.
magic cookie technology
**
Opaque binary blob Opaque binary blob (OBB) is a term used in network engineering and computer science to refer to a sizeable piece of data, which looks like binary garbage from outside, by entities which do not know what that blob denotes or carries, but make sense ...
, a network-engineering and computer-science technology
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