Déclinaison / Conjugueur latin
| SINGULIER |
| Nom. | nonagenarius |
| Gen. | nonagenarii |
| Dat. | nonagenario |
| Acc. | nonagenarium |
| Abl. | nonagenario |
| Voc. | nonagenarie |
| PLURIEL |
| Nom. | nonagenarii |
| Gen. | nonagenariōrum |
| Dat. | nonagenariis |
| Acc. | nonagenarios |
| Abl. | nonagenariis |
| Voc. | nonagenarii |
| SINGULIER |
| Nom. | nonagenariă |
| Gen. | nonagenariae |
| Dat. | nonagenariae |
| Acc. | nonagenariam |
| Abl. | nonagenariā |
| Voc. | nonagenariă |
| PLURIEL |
| Nom. | nonagenariae |
| Gen. | nonagenariārum |
| Dat. | nonagenariis |
| Acc. | nonagenarias |
| Abl. | nonagenariis |
| Voc. | nonagenariae |
| SINGULIER |
| Nom. | nonagenarium |
| Gen. | nonagenarii |
| Dat. | nonagenario |
| Acc. | nonagenarium |
| Abl. | nonagenario |
| Voc. | nonagenarium |
| PLURIEL |
| Nom. | nonagenaria |
| Gen. | nonagenariōrum |
| Dat. | nonagenariis |
| Acc. | nonagenaria |
| Abl. | nonagenariis | |