to restrict to or confine within prescribed limits, as prisoners of war, enemy aliens, or combat troops who take refuge in a neutral country.

to impound or hold within a country until the termination of a war, as a ship of a belligerent that has put into a neutral port and remained beyond a limited period.

a person who is or has been interned; internee.

verb

confine , detain , immure , imprison , incarcerate , lock

noun

apprentice , doctor , immure , resident , student , trainee