| Intinktion | intinction |
| Intention | intention |
| Intonation | intonation |
| Distinktion | distinction |
| Extinktion | extinction absorbance |
| Inunktion | embrocation unction |
| Intension | tenseness |
| Interaktion | interaction |
| Intubation | intubation |
| Intuition | intuition |
| Invention | invention |
| instinktiv | instinctive |
| Induktion | induction electromagnetic induction mathematical induction |
| Infektion | infection |
| Injektion | injection shot |
| Inspektion | inspection |
| Infixation | infixation |
| Initiation | initiation |
| Institution | fixture institution |
| Indikation | indication |