- intransitivize
- ionate
- isomerise
- immortalize
- introvert
- iodinate
- inactivate
- Islamise
- inspissate
- incandesce
- Islamize
- intensify
- individualize
- intransitivise
- invalidate
- increase
- insistent
- inflexible
- imitate
- impediment
- invite
- inviolable
- impregnable
- insecure
- instill
- ink
- impregnate
- infuse
- indorsement
- instrument panel
- inductance
- inductor
- intestinal obstruction
- ileus
- intercept
- investigating
- investigation
- irate
- irrational
- insanitary
- index linked
- is
- interlope
- inverted commas
- injection
- isolation
- interim
- indicant
- indication
- inspect