| Subject | Lithuanian | English |
| IT | analoginis operacinis blokas | analog operational unit |
| IT | bendroji operacinė programa | general interpretative programme |
| IT | bendroji operacinė programa | general interpretative program |
| IT | dvejetainis operacinis daugintuvas | binary operational multiplier |
| comp., MS | kompiuteris be operacinės sistemos | bare-metal computer (A computer that does not have an operating system installed) |
| comp., MS | "Microsoft" diskinė operacinė sistema | Microsoft Disk Operating System (A Microsoft computer operating system with a command-line interface that is used to control many internal computer functions, such as running programs and organizing and maintaining files) |
| gen. | mobilioji operacinė sistema | mobile platform |
| gen. | mobilioji operacinė sistema | mobile OS |
| gen. | mobilioji operacinė sistema | mobile operating system |
| comp. | mobiliųjų įrenginių operacinė sistema | mobile platform |
| comp. | mobiliųjų įrenginių operacinė sistema | mobile OS |
| comp. | mobiliųjų įrenginių operacinė sistema | mobile operating system |
| comp., MS | MS-DOS operacinė sistema | MS-DOS operating system (A Microsoft computer operating system with a command-line interface that is used to control many internal computer functions, such as running programs and organizing and maintaining files) |
| IT | nuolatinė operacinės sistemos vieta | System Residence |
| nucl.pow. | Operacinio saugumo patikros grupė | Operational Safety Assessment Review Team |
| nucl.pow. | Operacinio saugumo patikros grupė | Operational Safety Analysis Review Team |
| nucl.pow. | Operacinio saugumo patikros grupė | Operational Safety Review Team |
| IT | operacinis blokas | operational unit |
| IT | operacinis daugintuvas | operational multiplier |
| med. | operacinis laikotarpis | perioperative |
| med. | operacinis laikotarpis | peri-operative |
| IT | operacinis masyvas | transaction file |
| gen. | operacinis planavimas | operational planning |
| gen. | operacinis rengimas | operational training |
| IT | operacinis skaičiavimas | operational calculus |
| IT | operacinis stiprintuvas | operational amplifier |
| IT | operacinis stiprintuvas su lygiagrečiu grįžtamuoju ryšiu | parallel-feedback operational amplifier |
| gen. | operacinis vadovavimas | operational command |
| gen. | operacinis valdymas | operational control |
| IT | operacinis variantas | operation version |
| agric. | operacinis įvykis | operative event |
| gen. | operacinė aplinka | operational environment |
| IT | operacinė gramatika | operational grammar |
| IT | operacinė komanda | operational order |
| IT | operacinė lentelė | operational table |
| comp., MS | operacinė nepristatytų laiškų eilė | transactional dead-letter queue (For Message Queuing, a queue that stores transactional messages that cannot reach their destination queue. Transactional dead-letter queues store failed messages on the computer on which the message expired. Messages in these queues are written to disk and are therefore recoverable) |
| fin., insur. | operacinė rizika | operational risk |
| progr. | operacinė sistema | operating system (techninės ir programinės priemonės) |
| comp., MS | operacinė sistema | operating system (The software that controls the allocation and usage of hardware resources such as memory, central processing unit (CPU) time, disk space, and peripheral devices. The operating system is the foundation on which programs are built) |
| IT | operacinė įranga | operational equipment |
| health. | operacinės žaizdos infekcija | surgical site infection |
| gen. | pradinis operacinis pajėgumas | initial operational capability |
| gen. | pradinis operacinis pajėgumas | initial operating capability |
| IT | skaitmeninis operacinis daugintuvas | digital operational multiplier |
| IT | tiesinis operacinis stiprintuvas | linear operational amplifier |
| transp. | visiškas operacinis pajėgumas | full operational capability |
| gen. | visiškas operacinis pajėgumas | full operating capability |