Internal.n. An inmate, as of a school; especially, an assistant resident physician or surgeon in a hospital, usually a student or recent graduate, acting in the absence of the attending physician or surgeon.To send into the interior of a country, as merchandise.To confine within fixed or prescribed limits; specifically, to cause to reside in an interior locality without permission to leave it.Specifically, to confine (a ship of a belligerent) in a neutral port into which it may put: a duty of the neutral power, under the provisions of international law, in time of war.