intern
n. countablen. a student or recent graduate who works at a company for a short time to get experience. You usually do this to learn about a job you want in the future.
n. a student or trainee who works, sometimes without pay, in order to gain work experience or satisfy requirements for a qualification.
She is working as an intern at a law firm this summer.
The marketing department hired a summer intern to help manage their social media accounts and organize the annual conference.
While the position is unpaid, the intern gains invaluable exposure to the inner workings of a high-stakes architectural firm and builds a professional network for their future career.
From French interner, from interne (“inner, internal”), from Latin internus (“within, internal”), compare Etymology 2.
From French interne (“inner, internal”), from Latin internus (“within, internal”), from inter (“between”); compare Etymology 1.
Often used with the verbs 'do', 'serve', or 'work as'.