| Ionisation | ionization ionisation |
| Ionisationsstab | ionization bar ionizing bar |
| Ionisator | ioniser ionizer |
| -isation | -ization |
| Infixation | infixation |
| Initiation | initiation |
| Irritation | irritation |
| Animation | animation |
| Imitation | imitation |
| Indikation | indication |
| Inflation | inflation |
| Innovation | innovation |
| Ionisationsröhre | ionisation tube ionization tube |
| Ipsation | masturbation |
| Irrigation | irrigation |
| Kanonisation | canonization |
| Kolonisation | colonisation |
| Konfiskation | confiscation |
| Motivation | motivation |
| Nidation | nidation |