| Subject | English | Polish |
| gen. | be optimistic about the future | patrzeć jasno w przyszłość |
| comp., MS | optimistic concurrency | optymistyczna współbieżność (A method of managing concurrency by using a cached object's version information. Because every update to an object changes its version number, using version information prevents the update from overwriting someone else's changes) |
| comp., MS | optimistic duration | optymistyczny czas trwania (The best-case possibility for the total span of active working time expected for a task, that is, the amount of time from the optimistic start to optimistic finish of a task) |