| Irritation | irritation |
| Irrigation | irrigation |
| Imitation | imitation |
| Agitation | agitation |
| Exzitation | excitation |
| Gravitation | gravity gravitation |
| Kavitation | cavitation |
| Levitation | levitation |
| Meditation | meditation |
| Rezitation | recitation |
| Erdrotation | earth's rotation |
| Rotation | rotation |
| Infixation | infixation |
| Initiation | initiation |
| Derivation | derivation |
| Indikation | indication |
| Ionisation | ionization ionisation |
| Ordination | ordination |
| Variation | variation |
| irrational | irrational |