| Inunktion | embrocation unction |
| Inundation | flood |
| Nunation | nunation |
| Funktion | function map mapping |
| Intinktion | intinction |
| Induktion | induction electromagnetic induction mathematical induction |
| Infektion | infection |
| Injektion | injection shot |
| Funktions | functional |
| funktions | functional |
| ζ-Funktion | zeta function |
| Disjunktion | disjunction exclusive disjunction |
| Konjunktion | conjunction |
| Sanktion | sanction |
| infektiös | infectious |
| Auktion | auction |
| Inspektion | inspection |
| Ingestion | ingestion |
| Inhumation | inhumation |
| Inkubation | incubation |