Déclinaison / Conjugueur latin
| SINGULIER |
| Nom. | coaeternus |
| Gen. | coaeterni |
| Dat. | coaeterno |
| Acc. | coaeternum |
| Abl. | coaeterno |
| Voc. | coaeterne |
| PLURIEL |
| Nom. | coaeterni |
| Gen. | coaeternōrum |
| Dat. | coaeternis |
| Acc. | coaeternos |
| Abl. | coaeternis |
| Voc. | coaeterni |
| SINGULIER |
| Nom. | coaeternă |
| Gen. | coaeternae |
| Dat. | coaeternae |
| Acc. | coaeternam |
| Abl. | coaeternā |
| Voc. | coaeternă |
| PLURIEL |
| Nom. | coaeternae |
| Gen. | coaeternārum |
| Dat. | coaeternis |
| Acc. | coaeternas |
| Abl. | coaeternis |
| Voc. | coaeternae |
| SINGULIER |
| Nom. | coaeternum |
| Gen. | coaeterni |
| Dat. | coaeterno |
| Acc. | coaeternum |
| Abl. | coaeterno |
| Voc. | coaeternum |
| PLURIEL |
| Nom. | coaeterna |
| Gen. | coaeternōrum |
| Dat. | coaeternis |
| Acc. | coaeterna |
| Abl. | coaeternis | |