| operand | operand |
| operands | operandy |
| operant conditioning | nepodmíněný reflex |
| operas | opery |
| operate | pracovat |
| operated | ovládaný |
| operates | operuje |
| operatic | operní |
| operating | fungování |
| operating cost | náklady na provoz |
| operating data | provozní údaje |
| operating instructions | návod k použití |
| operating room | operační sál |
| operating surgeon | operující chirurg |
| operating system | operační systém |
| Operating system shell | Shell |
| Operatingsystem | Operační systém |
| operation | funkce |
| Operation Alsos | Alsos |
| Operation Anthropoid | Operace Anthropoid |
| Operation Bagration | Operace Bagration |
| Operation Barbarossa | Operace Barbarossa |
| Operation Barbarrosa | Operace Barbarossa |
| Operation Condor | Operace Condor |
| Operation Enduring Freedom | Operace Trvalá svoboda |
| operation frequency | provozní frekvence |
| Operation Frühlingserwachen | Operace Jarní probuzení |
| Operation Gladio | Operace Gladio |
| Operation Harpoon | Operace Harpoon |
| Operation Herkules | Herkules |
| Operation Joshua | Operace Jozue |
| Operation Magistral | Operace Magistrála |
| Operation Market Garden | Operace Market Garden |
| Operation Neptune | Bitva o Normandii |
| Operation Nordwind | Operace Nordwind |
| Operation Northwoods | Operace Northwoods |
| Operation Pedestal | Operace Pedestal |
| Operation Sealion | Operace Seelöwe |
| Operation Solomon | Operace Šalamoun |
| Operation Storm | Operace Bouře |
| operation stronghold | podpora pracovního postupu |
| Operation Typhoon | Bitva před Moskvou |
| Operation Weserübung | Operace Weserübung |
| Operation Wrath of God | Caesarea |
| operational | funkční |
| operational amplifer | operační zesilovač |
| Operational amplifier applications | Zapojení s operačním zesilovačem |
| operational antierosion measure | provozní protierozní opatření |
| operational erosion control measure | provozní protierozní opatření |
| operational performance indicator | indikátor profilu provozu |
| operationally | provozně |
| operations | operace |
| Operations Support Systems | Operations Support Systems |
| operative | operativní |
| operatives | tajní agenti |
| operator | telefonista |
| operators | operátoři |
| operculum | víčko |
