| jab | = | fodio |
| jagged edge | = | scrupulositas |
| jail | = | carcer |
| jammed | = | effertus, differtus |
| Janus | = | Ianus |
| jape | = | iocus |
| jar | = | orca |
| javelin | = | jaculum, cuspis, telum, iaculum |
| javelin man | = | iaculator |
| jaw | = | mala, bucca |
| jawbone | = | bucca |
| jay | = | pica |
| jealous of, be - | = | invideo |
| jealousy | = | zelus, invidia |
| jest | = | ioco iocor, iocus |
| jester | = | balatro |
| job | = | officium, labor |
| join (together) (vb) | = | continuo |
| join (vb) | = | subjungo, iungo iunxi iunctum, connecto |
| join | = | contineo, faeneror, addo, committo, adiungere, suo |
| join battle (vb) | = | praelium facio |
| join connect (vb) | = | adjungo |
| join in conflict | = | concero |
| join together (vb) | = | convenio |
| joined together | = | iunctus |
| joining | = | iunctio |
| joining | = | iunctura |
| joint | = | iunctura, communis, artus |
| joke (vb) | = | ioco iocor |
| joke | = | iocus |
| journey | = | iter itineris |
| journey | = | viaticus |
| joy | = | gaudium |
| joy | = | gaudium, laetitia, gaudium, tripudium |
| joyful, be - | = | laetor letor, gaudeo, exulto |
| joyous | = | laetans, laetabilis letabilis, gauisus (< gaudeo) |
| judge (vb) | = | probatur, decerno, iudico |
| judge | = | censor, pendo, sentio, iudex, judico, reputo |
| judgement | = | tentatio, judicium |
| judgment | = | iudicium, ratio, placitum, censura, arbitrium |
| judicial investigation | = | quaestio |
| judicious | = | sapiens, prudens |
| judiciously | = | sapienter |
| jump | = | salire, tripudio |
| juniper tree | = | iuniperus |
| jurisdiction | = | vox |
| juror | = | inquisitor |
| juror | = | iudex |
| just | = | iustus, solum, iam, licet |
| just as | = | prout, quemadmodum, tamquam tanquam, tanquam |
| just as far as | = | tantundem |
| just as if | = | quasi, tamquam tanquam |
| just as many | = | totidem |
| just belief | = | credulitas |
| just now | = | modo, prope |
| just short of | = | iuxta |
| just so long as | = | tantummodo |
| just so much | = | tantundem |
| justice | = | iustitia, justicia, ius iuris |
| justification | = | purgatio |
| justly | = | iuste |
| jut | = | promineo |
| jutting out | = | prominens |