| illiterate | unable to read or write |
| in perpetuity | describes as action or activity that's intended to last forever |
| incendiary | describes a weapon designed to cause a small fire; dropped together from aircraft to cause widespread damage |
| indemnity | an amount of money paid to someone because of some damage or loss they have suffered |
| infantry | soldiers who fight on foot |
| insurgent | person who fights against the army or government of their own country |
| internee | a person put in prison for political reasons, especially an enemy citizen during wartime or a terrorism suspect |
| internment | the practice of putting people, usually civilians, in prison for political reasons, especially enemy foreign nationals during wartime or terrorism suspects |
| invalided | remove someone from active service in the armed forces because of injury or illness |
| investiture | a ceremony in which someone is given an official title |
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