| irrational | irrational |
| Irrationalität | irrationality |
| Irrationalismus | irrationalism |
| irrationell | irrational |
| arational | arational |
| rational | rational |
| irrationale Zahl | irrational number |
| Rationale | rationale |
| kreationär | creationarily |
| national | national |
| relational | relational |
| direktional | directional |
| Irritation | irritation |
| Irrigation | irrigation |
| Oration | collect |
| Iteration | iteration |
| Kuration | cure |
| Migration | migration |
| Ration | ration |
| Titration | titration |