Déclinaison / Conjugueur latin
| SINGULIER |
| Nom. | coaetaneus |
| Gen. | coaetanei |
| Dat. | coaetaneo |
| Acc. | coaetaneum |
| Abl. | coaetaneo |
| Voc. | coaetanee |
| PLURIEL |
| Nom. | coaetanei |
| Gen. | coaetaneōrum |
| Dat. | coaetaneis |
| Acc. | coaetaneos |
| Abl. | coaetaneis |
| Voc. | coaetanei |
| SINGULIER |
| Nom. | coaetaneă |
| Gen. | coaetaneae |
| Dat. | coaetaneae |
| Acc. | coaetaneam |
| Abl. | coaetaneā |
| Voc. | coaetaneă |
| PLURIEL |
| Nom. | coaetaneae |
| Gen. | coaetaneārum |
| Dat. | coaetaneis |
| Acc. | coaetaneas |
| Abl. | coaetaneis |
| Voc. | coaetaneae |
| SINGULIER |
| Nom. | coaetaneum |
| Gen. | coaetanei |
| Dat. | coaetaneo |
| Acc. | coaetaneum |
| Abl. | coaetaneo |
| Voc. | coaetaneum |
| PLURIEL |
| Nom. | coaetanea |
| Gen. | coaetaneōrum |
| Dat. | coaetaneis |
| Acc. | coaetanea |
| Abl. | coaetaneis | |