1. Qualité de ce qui est opaque, presque impénétrable aux rayons de la lumière.
2. (Physique) Rapport entre le flux lumineux transmis et le flux incident.
3. (Au figuré) Manque de clarté d'esprit.
ETYM Latin opacitas: cf.French opacité.
Quality or state of being opaque. opacify, v. make or become opaque.
1. Incomprehensibility resulting from obscurity of meaning; SYN. opaqueness.
2. Not permitting the passage of light; SYN. opaqueness.
3. The quality of being opaque to a degree; the degree to which something reduces the passage of light; SYN. opaqueness.