Plural of Opus
“Opus” can pluralize as “opuses,” while “opera” is also recorded as a specialized or classical plural. In modern English, “opera” is independently a noun for a musical drama, so use the specialized plural only where the intended context makes that meaning clear.
The ordinary plural is “opuses”; dictionaries also record specialized “opera” as a plural of “opus.”
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| one work | opus | Singular. |
| several works | opuses | Ordinary accepted plural. |
| specialized/classical plural | opera | Recorded specialized plural. |
Quick tests
Plural-choice test
Are you referring to more than one work called an opus?
If yes: Use “opuses,” or specialized “opera” when that convention is clearly intended.
If no: Use singular “opus.”
Caveat: Because “opera” is also a separate modern English noun, context must prevent ambiguity.
Examples
The composer published several opuses in that period.
“Opuses” is the straightforward plural.
The catalogue uses opera as the specialized plural of opus.
The classical plural is recorded in specialized use.
This opus was written for strings.
One work takes singular “opus.”
Further guidance
Core difference
Use “opuses” as the straightforward plural; use specialized “opera” only when that convention clearly fits the context.
Fast Test
If readers could mistake “opera” for musical dramas, “opuses” is usually the clearer plural form.
Usage Boundary
Do not teach “opera” as the only correct plural of “opus.”
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- OPUS | English meaning - Cambridge Dictionary (opens in a new tab)Cambridge University Press · Cambridge records opuses and specialized opera as plural forms of opus.
- OPUS Definition & Meaning - Merriam-Webster (opens in a new tab)Merriam-Webster · Merriam-Webster records opera and also opuses as plurals of opus.