| Singular | Plural | |
|---|---|---|
| Nominativ | catechumatus | catechumatus, catechumatuus |
| Genitiv | catechumatus, catechumati, catechumatos | catechumatum, catechumatuum |
| Dativ | catechumatu, catechumatui | catechumatibus, catechumatubus |
| Akkusativ | catechumatum | catechumatus, catechumatuus |
| Ablativ | catechumatu | catechumatibus, catechumatubus |
| Vokativ | catechumatus | catechumatus, catechumatuus |