| Singular | Plural | |
|---|---|---|
| Nominativ | contractoriom, contractorium | contractoria |
| Genitiv | contractorii | contractoriorum, contractorium |
| Dativ | contractorio | contractoriis |
| Akkusativ | contractorium | contractoria |
| Ablativ | contractorio | contractoriis |
| Vokativ | contractorium | contractoria |