| A | B |
| Incumbent | adj currently holding an office; obligatory |
| Incursion | n a hostile invasion; a raid |
| Indict | v to charge with a crime; to accuse of wrongdoing |
| Induce | v to persuade; to influence; to cause |
| Ineluctable | adj inescapable; incapable of being resisted or avoided |
| Ineradicable | adj incapable of being removed or destroyed or eradicated |
| Inflammatory | adj fiery; tending to arouse passion or anger; incendiary |
| Influx | n arrival of large numbers of people or things; inundation |
| Infraction | n violation; infringement; the breaking of the law |
| Infrastructure | n the basic framework of a system; foundation |
| Infringe | v to violate; to encroach or trespass |
| Infuse | v to introduce into; to instill |