Déclinaison / Conjugueur latin
| SINGULIER |
| Nom. | trimenstris |
| Gen. | trimenstris |
| Dat. | trimenstri |
| Acc. | trimenstrem |
| Abl. | trimenstri |
| Voc. | trimenstris |
| PLURIEL |
| Nom. | trimenstres |
| Gen. | trimenstrĭum |
| Dat. | trimenstrĭbus |
| Acc. | trimenstres |
| Abl. | trimenstrĭbus |
| Voc. | trimenstres |
| SINGULIER |
| Nom. | trimenstris |
| Gen. | trimenstris |
| Dat. | trimenstri |
| Acc. | trimenstrem |
| Abl. | trimenstri |
| Voc. | trimenstris |
| PLURIEL |
| Nom. | trimenstres |
| Gen. | trimenstrĭum |
| Dat. | trimenstrĭbus |
| Acc. | trimenstres |
| Abl. | trimenstrĭbus |
| Voc. | trimenstres |
| SINGULIER |
| Nom. | trimenstre |
| Gen. | trimenstris |
| Dat. | trimenstri |
| Acc. | trimenstre |
| Abl. | trimenstri |
| Voc. | trimenstre |
| PLURIEL |
| Nom. | trimenstrĭa |
| Gen. | trimenstrĭum |
| Dat. | trimenstrĭbus |
| Acc. | trimenstrĭa |
| Abl. | trimenstrĭbus | |