Real Dictionary

intern
If someone is interned, they are put in prison or in a prison camp for political reasons.
countable noun: An intern is an advanced student or a recent graduate, who is being given practical training under supervision.

intern in American English
a doctor serving an apprenticeship as an assistant resident in a hospital generally just after graduation from medical school
to detain or confine (foreign persons, ships, etc.), as during a war
to serve as an intern

intern in American English 1
noun: a person who is or has been interned; internee
transitive verb: to restrict to or confine within prescribed limits, as prisoners of war, enemy aliens, or combat troops who take refuge in a neutral country

intern in American English 2
intransitive verb: to be or perform the duties of an intern
noun: a resident member of the medical staff of a hospital, usually a recent medical school graduate serving under supervision

intern in American English 3
adjective: internal

intern in British English
adjective
verb: to detain or confine (foreign or enemy citizens, ships, etc), esp during wartime

intern in Retail
noun: An intern is someone, often a young person, employed temporarily for work experience, but usually unpaid.