intern (v.) Look up intern at Dictionary.com
1866, "to confine within set limits," from French interner "send to the interior, confine," from Middle French interne "inner, internal," from Latin internus "within, internal" (see internal; also compare intern (n.)).
intern (n.) Look up intern at Dictionary.com
1879, American English, "one working under supervision as part of professional training," especially "doctor in training in a hospital," from French interne "assistant doctor," literally "resident within a school," from Middle French interne "internal" (see intern (v.)). The verb in this sense is attested from 1933. Related: Interned; interning.