| Singular | Plural | |
|---|---|---|
| Nominativ | commemoratoriom, commemoratorium | commemoratoria |
| Genitiv | commemoratorii | commemoratoriorum, commemoratorium |
| Dativ | commemoratorio | commemoratoriis |
| Akkusativ | commemoratorium | commemoratoria |
| Ablativ | commemoratorio | commemoratoriis |
| Vokativ | commemoratorium | commemoratoria |