| 영단어 | 라틴어 표현 |
| open | expositus, patefacio, directus |
| open to all | publicus |
| opening | foramen, foris, os |
| openly | candide, aperte, palam, libere |
| opinion | sententia, opinio, iudicium |
| opponent | inimicus |
| opportune | opportunus |
| opportunely | opportune |
| opportunity | oportunitas, facultas, commodum, occasio, commodum |
| opportunity /event | casus |
| oppose | resisto, oppono opposui oppositum |
| oppose /help | obviam ire |
| oppose verbally | contradico |
| opposed | contrarius, diversus |
| opposite | econtra |
| opposition | contradictio |
| oppress | praegravo, onero, conculco |
| oppressed | gravatus |
| opulence | luxuria |
| opulent | dives |