| Singular | Plural | |
|---|---|---|
| Nominativ | fideicommissum, fideicommissom | fideicommissa |
| Genitiv | fideicommissi | fideicommissorum, fideicommissum |
| Dativ | fideicommisso | fideicommissis |
| Akkusativ | fideicommissum | fideicommissa |
| Ablativ | fideicommisso | fideicommissis |
| Vokativ | fideicommissum | fideicommissa |
12 (14) Formen für „fideicommissum“