Opacity (disambiguation)

Opacity may refer to:

• Opacity (optics), the degree to which light is not allowed to travel through
• Opaque context, a term to describe the linguistic context of co-referential terms
• Phonological opacity, a term in phonology
• Opaque travel inventory, the market of selling unsold travel inventory at a discounted price

Computer science

• How much an image will obscure the background when painted, usually defined by its alpha channel
• The use of an opaque data type, a data type that is incompletely described in a module interface
• Said of data that can only be interpreted by an external entity, such as a magic cookie
• Opaque binary blob, a term used in network engineering and computer science