opacity

/oʊˈpæsɪti/

//oʊˈpæsɪti// noun

By · According to Wiktionary data (CC BY-SA) ·

"opacity" is a 7-letter English headword indexed on PlainSpell.

The verdict

“opacity” has 10 generated spelling variants in the English index at frequency #35,441. The variants make it a useful spelling check.

#35,441
frequency rank, English
15,494
“O” headwords
10
tracked misspellings

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The state or quality of being opaque, not allowing light to pass through.

Key facts for opacity
PropertyValue
Headwordopacity
LanguageEnglish
Part of speechNoun
IPA/oʊˈpæsɪti/
Letters7
Frequency rank#35,441
Misspellings tracked10
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “opacity” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). opacity lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 10 spelling variants around opacity (IPA /oʊˈpæsɪti/), anoun. Corpus frequency is #35,441 among 15,494 “O” headwords. Wiktionary lists 4 senses, so context still picks the gloss.

Our generated misspelling index lists 10 likely wrong-spelling variants for opacity, with forms such as "oapcity", "opaccity", and "opacitty". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. This entry stands alone in our confusable dataset, suggesting its spelling stands apart enough that readers rarely confuse it with something else.

Etymologically, the entry records: From opaque + -ity, from French opacité, from Latin opacitas. The correct English form is opacity, spelled O-P-A-C-I-T-Y.

Definition

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

Etymology

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

Synonyms

nontransparencyopaqueness

This word in other languages

opacidad(Español)opacité(Français)Opazität(Deutsch)opacidade(Português)

Common misspellings

Also misspelled as:

  • oapcity
  • opaccity
  • opacitty
  • opacityy
  • opaciyt
  • opactiy
  • opaicty
  • opcaity
  • oppacity
  • poacity

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of opacity - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

oapcity2opaccity1opacitty1opacityy1opaciyt2opactiy2opaicty2opcaity2
Edit distance from "opacity"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "opacity"?
"opacity" is spelled O-P-A-C-I-T-Y. The IPA pronunciation is /oʊˈpæsɪti/.
What does "opacity" mean?
As a noun, "opacity" means: The state or quality of being opaque, not allowing light to pass through.
What are common misspellings of "opacity"?
Common misspellings include "oapcity", "opaccity", "opacitty", "opacityy", "opaciyt". The correct spelling is "opacity".
How do you pronounce "opacity"?
The IPA (International Phonetic Alphabet) transcription for "opacity" is /oʊˈpæsɪti/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "opacity"?
From opaque + -ity, from French opacité, from Latin opacitas. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “opacity”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is O-P-A-C-I-T-Y - every other letter order is a misspelling in standard orthography.
  • Say it as /oʊˈpæsɪti/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Browse more English words and confusable pairs in the same reference. English words

Same frequency band

Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list