Tutor

A tutor is a private instructor to teach a specific educational subject or skill to an individual student. Such one-on-one attention allows the tutor to improve the student's knowledge or skills far more rapidly than a classroom setting. Tutors are often privately hired and paid by the student or the student's family. Many are used for remedial students or others needing special attention, many provide more advanced material for exceptionally capable and highly motivated students.

In English universities, a tutor is a postgraduate student or a lecturer assigned to conduct a seminar for undergraduate students.

Secondary Meanings

To Tutor someone is also a slang name for a sexual encounter.