The word began in hospitals. Medical interns lived inside the building where they trained.
The word intern comes from the Latin internus, meaning inward or internal. In nineteenth-century American English, it described a medical graduate who lived and worked inside a hospital, literally residing within the institution while completing supervised training.1 The word internship followed naturally: the condition of being an intern, of living inside.
The first American hospital internships formalized in the 1870s and 1880s, as medical education shifted from apprenticeship to institutional training. By 1904, the American Medical Association had begun standardizing the internship requirement for medical graduates.2 The intern was not an employee. The intern was a student who happened to work.
The word migrated outside medicine in the mid-twentieth century, as corporations adopted it to describe temporary, often unpaid positions for college students. By the 1960s and 1970s, the corporate internship had become a pathway into white-collar employment.3 The medical meaning implied total immersion and residential commitment. The corporate meaning retained the label but discarded the structure.
In 2011, the National Association of Colleges and Employers estimated that roughly half of American internships were unpaid.4 The word that began by describing a physician living inside a hospital now described a college student working without compensation in the hope that proximity to a profession would eventually lead to membership in it.