| Singular | Plural | |
|---|---|---|
| Nominativ | circumplexus | circumplexus, circumplexuus |
| Genitiv | circumplexus | circumplexuum |
| Dativ | circumplexui | circumplexubus, circumplexibus |
| Akkusativ | circumplexum | circumplexus, circumplexuus |
| Ablativ | circumplexu | circumplexibus, circumplexubus |
| Vokativ | circumplexus | circumplexus, circumplexuus |