OPACITY
opacity, opaqueness
(noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light
opacity, opaqueness
(noun) incomprehensibility resulting from obscurity of meaning
opacity
(noun) the phenomenon of not permitting the passage of electromagnetic radiation
Source: WordNet® 3.1
Etymology
Noun
opacity (countable and uncountable, plural opacities)
(uncountable) The state or quality of being opaque, not allowing light to pass through
(uncountable) The state or quality of being inaccessible to understanding.
(optics, countable) A measure of relative impenetrability to electromagnetic radiation such as light.
Synonyms
• opaqueness
Coordinate terms
• transparency
Source: Wiktionary
O*pac"i*ty, n. Etym: [L. opacitas: cf.F. opacité.]
1. The state of being opaque; the quality of a body which renders it
impervious to the rays of light; want of transparency; opaqueness.
2. Obscurity; want of clearness. Bp. Hall.
Source: Webster’s Unabridged Dictionary 1913 Edition