Declension tables
Masculine
pater, patris (m) - father
| Case | sing. | pl. |
| Nom. | pater | patres |
| Acc. | patrem | patres |
| Gen. | patris | patrum |
| Dat. | patri | patribus |
| Abl. | patre | patribus |
Feminine
mater, matris (f) - mother
| Case | sing. | pl. |
| Nom. | mater | matres |
| Acc. | matrem | matres |
| Gen. | matris | matrum |
| Dat. | matri | matribus |
| Abl. | matre | matribus |
Neuter
nomen, nominis (n) - name
| Case | sing. | pl. |
| Nom. | nomen | nomina |
| Acc. | nomen | nomina |
| Gen. | nominis | nominum |
| Dat. | nomini | nominibus |
| Abl. | nomine | nominibus |
The genitive singular will always show the stem change. When looking up third declension words you will find the stem given as: pater, -ris to show the change. It is important to learn both the nominative and the genitive so that you know how the full paradigm will decline.
A variation: i-stems
Some words gain an extra -i- in the genitive plural. These are words that in the nominative have the ending -is, or are only one syllable.
rex, regis (m) - king
| Case | sing. | pl. |
| Nom. | rex | reges |
| Acc. | regem | reges |
| Gen. | regis | regium |
| Dat. | regi | regibus |
| Abl. | rege | regibus |
