tutor

A private instructor.

One that gives additional, special, or remedial instruction.

A teacher or teaching assistant in some universities and colleges having a rank lower than that of an instructor.

A graduate, usually a fellow, responsible for the supervision of an undergraduate at some British universities.

The guardian of a minor.

To act as a tutor to; instruct or teach privately.

To have the guardianship, tutelage, or care of.

To function as a tutor.

To be instructed by a tutor; study under a tutor.