opacity: Meaning and Definition of

o•pac•i•ty

1. the state or quality of being opaque.
2. something opaque.
3. the degree to which a substance is opaque; capacity for being opaque.
4. the proportion of the light that is absorbed by the emulsion on any given area of a film or plate.
5. obscurity of meaning.
6. mental dullness.
7. an opaque spot or area in normally clear or transparent tissue, as a cataract of the eye.