- European-based U.S. nuclear weapons that were capable of striking the Soviet Union and Soviet ones that could hit Western Europe (usually used attributively): INF missiles;the 1987 INF Treaty.
- in the end; finally.
- infantry.
- infuse.
- infinitive
- informal
- infra
- intermediate-range nuclear forces: land-based missiles and aircraft with a range between 500 and 5000 km
