Source: The Collaborative International Dictionary of English v.0.48
Opacity \O*pac"i*ty\, n. [L. opacitas: cf. F. opacit['e].]
1. The state of being opaque; the quality of a body which
renders it impervious to the rays of light; want of
transparency; opaqueness.
[1913 Webster]
2. Obscurity; want of clearness. --Bp. Hall.
[1913 Webster]
opacity
n 1: the phenomenon of not permitting the passage of
electromagnetic radiation [ant: transparency]
2: incomprehensibility resulting from obscurity of meaning
[syn: opaqueness]
3: the quality of being opaque to a degree; the degree to which
something reduces the passage of light [syn: opaqueness]
[ant: clearness]