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.
Internal.
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.