To confine someone as a prisoner, especially for political or military reasons. During the war, the government decided to intern enemy aliens in camps.
To work as an intern, typically as part of a course of study or training. She decided to intern at a law firm over the summer to gain practical experience.
To employ or accept (someone) as an intern for training or work experience. The tech firm interns dozens of computer-science students every summer.
(Computing) To place (a string or other object) in a shared pool so that identical instances refer to the same memory location. The Java Virtual Machine automatically interns string literals to save memory.