(uncountable) The state or quality of being opaque, not allowing light to pass through / (uncountable) The state or quality of being inaccessible to understanding.

(library science) Acronym of online public access catalog.

plural of opacity

(obsolete, chiefly poetic) Not shining or illuminated; dark. / (obsolete) Not allowing the passage of light; opaque.

simple past tense and past participle of opacate

Third-person singular simple present indicative form of opacate

present participle of opacate

Making or becoming opaque.

(obsolete) To darken; to cloud.

(obsolete) Opacity.