| Irrigation | irrigation |
| Irritation | irritation |
| Obligation | bond obligation |
| Religation | religation |
| Navigation | navigation |
| Surrogation | subrogation |
| Abrogation | abrogation |
| Infixation | infixation |
| Derivation | derivation |
| Imitation | imitation |
| Immigration | immigration |
| Indikation | indication |
| Ionisation | ionization ionisation |
| Ordination | ordination |
| Variation | variation |
| Irrgarten | labyrinth maze knot garden |
| irrational | irrational |
| Kolligation | colligation |
| Aggregation | aggregation |
| Delegation | delegation |