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| English | Russian |
| Opus Citatum | процитированное произведение (Op.Cit.) |
| Opus Dei Roman Catholic organization of laymen and priests whose members pledge to seek personal Christian perfection and strive to implement Christian ideals in their chosen occupations | Дело Божие |
| opus operantis | опус оперантис (A theological term, "the act of the doer") |
| opus operatum | опус оператум (A theological term, "the act done") |