A person who is interned, forcibly or voluntarily.

To imprison somebody, usually without trial.

“The US government interned thousands of Japanese-Americans during World War II.”

To internalize.

A student or recent graduate who works in order to gain experience in their chosen field

A medical student or recent graduate working in a hospital as a final part of medical training

To work as an intern. Usually with little or no pay or other legal prerogatives of employment, for the purpose of furthering a program of education.

“I'll be interning at Universal Studios this summer.”