# opacity

> English word · Noun · IPA /oʊˈpæsɪti/ · frequency rank #35,441

## Definitions
1. The state or quality of being opaque, not allowing light to pass through.
2. The state or quality of being inaccessible to understanding.
3. A measure of relative impenetrability to electromagnetic radiation such as light.
4. An opaque area.

## Etymology
From opaque + -ity, from French opacité, from Latin opacitas.

## Common misspellings (10)
`oapcity`, `opaccity`, `opacitty`, `opacityy`, `opaciyt`, `opactiy`, `opaicty`, `opcaity`, `oppacity`, `poacity`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/opacity