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| Subject | English | Thesaurus |
| water.suppl. | O & M program | operation and maintenance program |
| abbr. | O.F.M.Cap. | Ordo Minorum Cappucinorum (Capuchins) |
| lat. | O.M.Cap. | Ordo Minorum Cappucinorum (Capuchins) |
| abbr., telecom. | O&M center | operation and maintenance center |