From Latin 'tutor' (guardian), from 'tueri' (to watch over) — shifted from legal protector to teacher.
A private teacher who instructs a single pupil or a small group; in British universities, an academic adviser responsible for the personal supervision of assigned students.
From Latin 'tutor' (a guardian, a protector, a watcher), agent noun from 'tueri' (to watch over, to guard, to protect), from PIE *teu- (to pay attention to, to observe). The original sense was legal and familial, not educational: a 'tutor' in Roman law was the guardian appointed to manage the affairs of a minor or an incompetent person. The educational sense developed because the guardian's role included