| A | B |
|---|
| ob | because of, on account of |
| obliviscor | forget |
| obses | hostage |
| obsideo | besiege, blockade |
| obviam eo | meet, resist, oppose |
| occasio | opportunity |
| occido | kill |
| occupo | seize |
| oculus | eye |
| odi | hate |
| odium | hatred |
| odio est | be hated by |
| officium | duty, task, function |
| offero | present, offer |
| olim | once, formerly, one day |
| omitto | neglect, disregard, make no mention of |
| omnis | all |
| omnino | altogether, at all, entirely |
| onus | burden, load |
| opera | work, effort, attention, trouble |
| operam do | I take pains, give attention to |
| oportet | be necessary, ought, must |
| oppidum | town |
| opportunus | suitable, opportune |
| opprimo | overwhelm, weigh down |
| oppugno | attack |
| ops, opis | help, (pl) resources, riches |
| opus, operis | work, toil, construction |
| opus est | there is need of |
| ora | coast |
| oratio | speech |
| ordo | rank, order, line |
| orior | rise, start, originate |
| orno | adorn, decorate |
| oro | beg |
| os | mouth, face |
| ostendo | show, point out, indicate |
| otium | leisure, idleness, peace |
|
