opacity

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opacity

/oʊˈpæsɪti/ US

Where it comes from

From opaque + -ity, from French opacité, from Latin opācitās, from opācus.

noun opacities

uncountable The state or quality of being opaque, not allowing light to pass through. We could not see the sandbar due to the opacity of the muddy water.
Similar: opaqueness, nontransparency · Opposite: clarity, clearness, translucency, transparency
uncountable The state or quality of being inaccessible to understanding. The opacity of these decisions is troubling.
Opposite: clarity, lucidity
countable A measure of relative impenetrability to electromagnetic radiation such as light. The opacity of a clean glass window is near zero.
countable An opaque area. This report concerns a child with Down's syndrome (mongolism) and bilateral congenital corneal opacities born into a family affected through three generations by Rieger's anomaly.

Translations

Every language

noun state of being opaque; blocking light

Español	opacidad
हिन्दी	अपारदर्शिता apārdarśitā
Português	opacidade
Français	opacité
Deutsch	Opazität, Undurchsichtigkeit, Lichtundurchlässigkeit
Ελληνικά	αδιαφάνεια adiafáneia
Русский	непрозра́чность neprozráčnostʹ

noun state of being inaccessible to understanding

Français	opacité
Deutsch	Undurchsichtigkeit, Nebulösität

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MLA

"opacity." Wiktionary, via Micwyn, micwyn.com/word/opacity. Accessed 6 Nov. 2026.

APA

opacity. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/opacity

Chicago

"opacity." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/opacity.

BibTeX

@misc{opacity_2026,
  title = {opacity},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/opacity},
  urldate = {2026-11-06}
}