Opacity - Definition
opacity
n 1: the phenomenon of not permitting the passage of
electromagnetic radiation [ant: transparence,
transparency]
2: incomprehensibility resulting from obscurity of meaning [syn:
opacity, opaqueness]
3: the quality of being opaque to a degree; the degree to which
something reduces the passage of light [syn: opacity,
opaqueness] [ant: clarity, clearness, uncloudedness]