| Infektion | infection |
| infektiös | infectious |
| Injektion | injection shot |
| Inflation | inflation |
| Reinfektion | reinfection |
| Konfektion | make manufacture ready-to-wear off-the-peg clothing off-the-rack clothing clothing industry |
| Inspektion | inspection |
| Induktion | induction electromagnetic induction mathematical induction |
| Inunktion | embrocation unction |
| Ingestion | ingestion |
| Invention | invention |
| Intention | intention |
| Infestation | infestation |
| Infixation | infixation |
| Desinfektion | disinfection |
| Infekt | infection |
| Infusion | infusion |
| infertil | infertile |
| Perfektion | perfection |
| Bijektion | bijection |