| obdormio | = | to fall asleep |
| obduco | = | to draw over, cover, lead against, pass, spend |
| obductio | = | covering |
| obduro | = | to be hard, persist, endure, last, hold out |
| obedienter | = | obediently |
| obedio | = | to yield obedience to |
| obex | = | barrier |
| obfirmo | = | to bolt, lock, fasten, bar |
| obicio obieci obiectum | = | to offer, throw in someone's teeth |
| obitus | = | death |
| objurgo | = | to fight, attack, oppose |
| obligatus | = | bound, under an obligation |
| obliquo | = | to turn sideways, turn aside |
| obliquus | = | slanting |
| oblittero | = | to cancel, blot out |
| oblivio | = | forgetfulness, oblivion |
| obnixe | = | with all one's strength, instantly |
| obnoxius | = | harmful, hostile |
| obnubilo | = | to overcloud |
| obruo | = | to overwhelm, destroy |
| obscoena | = | offensive, filthy |
| obscurum | = | darkness |
| obscurus | = | dark, dim |
| obsequens | = | compliant |
| obsequium | = | indulgence, pliancy, submission |
| obsequium | = | obedience, indulgence |
| obsequium funeris | = | funeral rites |
| obses | = | surety, hostage |
| obses (obsidis) | = | hostage, security, pledge, surety |
| obsideo | = | to sit near, haunt, frequent, besiege, invest |
| obsido | = | blockage, besiege, invest |
| obstaculum | = | obstacle |
| obstinatus | = | firm, resolved, staunch |
| obstinatus | = | resolute |
| obsto | = | to oppose, defend, stand against |
| obsum | = | to hinder |
| obtempero | = | to obey |
| obtero | = | to bruise |
| obtestor | = | to assert |
| obtestor | = | to implore, entreat, beg, call as a witness |
| obtineo | = | to hold, keep, possess, maintain, to continue |
| obtineo | = | to gain |
| obtutus | = | gaze |
| obviam | = | on the way, in the way, (+ dat.) |
| obviam (adverb) | = | in the way, on the way, toward |
| obviam ire (+ dat.) | = | to go to meet, oppose, help, remedy |
| obvio | = | to encounter, meet |
| obvius | = | on the way, in the way, (in dat.) |
| obvolvo | = | to muffle up |
| obvolvo | = | to wrap up, cover |
| occasio | = | opportunity |
| occasio | = | favorable moment, opportunity |
| occasus | = | setting (of the sun, etc), the west, fall |
| occasus | = | sunset, west |
| occatio | = | harrowing |
| occidio | = | slaughter, massacre |
| occido | = | to kill |
| occisor | = | murderer |
| occludo | = | to close, shut up, close off |
| occulco | = | to trample (down) |
| occulte | = | secretly, in secret, by stealth |
| occulto | = | to hide, conceal, cover |
| occultus | = | hidden, concealed, secretly |
| occumbo | = | to fall, topple, drop, fall dead |
| occumbo | = | to fall |
| occupo | = | to take possession, grasp, seize, enjoy |
| occupo | = | to occupy, seize, appropriate, confiscate |
| occuro | = | to occur, come about, happen |
| occurro | = | to go to meet, rush upon |
| occurro | = | to occur, run to meet, attack, oppose, work again |
| occursus | = | a meeting |
| Oceanus | = | Oceanus |
| ocius | = | quick. fleet, sooner, faster |
| octavus | = | eighth |
| octo | = | eight |
| octoginta | = | eighty |
| oculus | = | eye |
| odio | = | to hate, despite, hold in contempt, dislike |
| odium | = | hatred |
| odium | = | hate |
| odor | = | odor, odour, scent, smell |
| odorifera | = | fragrant |
| odorus | = | keen scenter, sharp nosed |
| oestrus | = | horse-fly, frenzy |
| offa | = | lump, swelling, pellet, shot, mass of something |
| offendo | = | stumble, lurch |
| offendo | = | to displease |
| offendo | = | to knock, hit, strike, shock, offend, displease |
| offensio | = | striking, knocking, hitting against, blow |
| offensio | = | cause of offense |
| offensus | = | offense |
| offensus | = | collision, shock, dislike, displeasure |
| offero | = | to bring forward, place before, present, offer |
| officina | = | workshop, factor |
| officiose | = | courteously, dutifully, solemnly, ceremoniously |
| officiosus | = | respectful, attentive |
| officium | = | duty, service, job, post, position, responsibility |
| officium | = | office, obligation, duty |
| olim | = | once, at a future time |
| olim | = | at that time, formerly, once, for a long time now |
| olus | = | vegetable |
| Olympus | = | heaven, home of the gods, height of eminence |
| omitto | = | to omit, leave out, let go |
| omitto | = | to let slip, lose, pardon |
| omnifariam | = | in every way |
| omnigenus | = | of all kinds |
| omnimodus | = | universal |
| omnino | = | altogether, entirely, wholly, certainly, complete |
| omnipotens | = | all-powerful, almighty, omnipotent |
| omnis | = | all, every |
| oneratus | = | loaded |
| onero | = | to load, burden, oppress, fil up |
| onus | = | load, burden, weight, trouble, charge |
| onustus | = | burdened, laden |
| opera | = | work, pains, labor |
| opera | = | effort |
| operae pretium est | = | it is worthwhile |
| operatio | = | work |
| operor | = | to work, labor, toil, take pains |
| operor | = | to be active, do |
| opes (pl.) | = | means, wealth, abundance, riches, resources |
| opilio | = | shepherd |
| opimus | = | splendid |
| opinio | = | rumor |
| opinio | = | opinion, report, rumor, conjecture |
| opinor | = | -atus, 1, dep. v, to be of the opinion of |
| opisthotonos | = | A disease where the body is curved backward |
| opium | = | opium |
| oporotheca | = | place for keeping fruit |
| oportet | = | it is fitting, it is proper, reasonable, becoming |
| oportet | = | imper v., to assume it shall be, reasonable |
| oportet | = | it is proper, one should, one ought |
| oportet | = | it is needful, it behooves |
| oportunitas | = | convenience, fitness, advantage, opportunity |
| oppidum | = | city, town |
| oppidum (fortified) | = | town |
| oppono opposui oppositum | = | to set against, oppose, be opposite |
| opportune | = | fitly |
| opportune (adv) | = | opportunely, conveniently |
| opportunitas | = | fitness, suitability, convenience, advantage |
| opportunus | = | opportune, fit, convenient, suitable |
| opportunus | = | fit, suitable, liable to |
| opportunus | = | meet |
| opprimo | = | to subdue, overpower, press against, take by surp |
| opprimo oppressi oppressum | = | to suppress, overwhelm, overpower, check |
| opprobrium | = | reproach, disgrace |
| oppugnare | = | assault, attack |
| oppugno | = | to war with, storm |
| oppugno | = | to fight against, attack, assault, assail |
| ops | = | assistance, treasure, wealth, fortune |
| optatus | = | longed-for |
| optimates | = | the aristocratic party |
| optimates | = | magnates, great lords, the best people, the upper |
| optime | = | as best one can |
| optimus | = | one of the best, aristocrat, noble |
| opto | = | to wish for |
| opto | = | to desire, wish for, want |
| opulens | = | rich, wealthy, powerful, mighty, splendid |
| opulentia | = | riches, wealth, power, might, opulence, splendor |
| opulentia | = | wealth |
| opulentus | = | wealthy, splendid |
| opus | = | deed, labor |
| opus | = | work |
| opus operis | = | work, labor, work done, completed work, building |
| opusculus | = | a little or small work, a small book |
| ora | = | edge, rim, border, boundary, coast, coast-line |
| ora | = | coast, seaside, shore |
| ora | = | region, clime, district, country |
| ora | = | sea-coast |
| oraculum | = | a solemn statement, oracle, prophecy |
| orare | = | pray |
| oratio | = | prayer |
| oratio | = | speech, address, oration |
| orator | = | orator, speaker. spokesman, envoy, ambassador |
| oratorie | = | oratorically |
| oratorius | = | oratorical, oratory |
| oratu (abl.sing.m.) | = | by request |
| orbis | = | circle, orb, ring, disk, orbit, coil, round |
| orbis | = | world, circle |
| orbis | = | circle |
| orbis lacteus | = | the Milky Way |
| orbis signifer | = | the Zodiac |
| orbis terrarum | = | the world, the Earth |
| orbita | = | a wheel rut |
| orbitas | = | bereavement, loss of children, loss of parents |
| orbus | = | destitute |
| orbus | = | deprived of children or parents, orphan, deprived |
| orca | = | a pot or jar |
| orchestra | = | theater space reserved for the Senate, senators |
| orcus | = | the Lower World, whale |
| ordinarius | = | according to order, regular, ordinary |
| ordinatim | = | regularly, ordinarily |
| ordinatio | = | rule, government, order, arrangment, regulation |
| ordinatus | = | arranged, orderly |
| ordine, ordinem | = | regularly, appropriately, properly |
| ordino (-are) | = | to set in order, regulate, arrange, appoint |
| ordo | = | rank, class, order |
| orexis | = | appetite, desire |
| organum | = | instrument, musical instrument |
| orgia | = | orgy |
| orgia | = | a festival of mysteries, orgy |
| orichalcum | = | copper ore, brass |
| oriens | = | rising, the rising sun, east, morning |
| Orientales | = | Easterners |
| orior | = | to be born, to be a consequence or result of |
| orior | = | rise, become visible, appear |
| orior oriri ortus | = | rise, become visible, appear |
| oriundus | = | born |
| oriundus | = | arising from, springing from, coming from |
| ornamentum | = | equipment, kit, trappings, furniture, decorations |
| ornamentum | = | weapons, honor, distinction |
| ornamentum | = | accoutrement |
| ornata | = | adorned |
| ornate | = | splendidly, ornately, elegantly |
| ornatus | = | to adornment |
| ornatus | = | dress, attire, equipment, ornament, embellishment |
| orno | = | to equip, furnish, supply, decorate, adorn |
| ornus | = | mountain ash |
| oro | = | to speak, argue, plead, orate, beg, entreat |
| orsus | = | a beginning, undertaking, initiative |
| ortigometra | = | quail |
| ortus | = | -us, m, birth, origin, rising, source |
| oryza | = | rice |
| os | = | bone |
| ostendo | = | -ere-di sum, to show, to exhibit |
| ostes | = | earthquake |
| ostium | = | entrance, door |
| ostrea | = | oyster |
| otacustes | = | spy |
| otium | = | free time, leisure, ease, peace, repose |
| ovanter | = | exultingly |
| ovis | = | sheep |
| ovis ovis | = | sheep |
| ovum | = | egg |