| Subject | English | Catalan |
| math. | operating characteristic | característica operativa |
| math. | operating characteristic | funció d'eficiència |
| stat. | operating characteristic | investigació operativa |
| proj.manag. | operating conditions | condicions de servei |
| environ. | operating data Data referring to the practical carrying-out of a process | dades de funcionament |
| comp., MS | operating system | sistema operatiu (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) |