n. A private instructor.n. One that gives additional, special, or remedial instruction.n. A teacher or teaching assistant in some universities and colleges having a rank lower than that of an instructor.n. A graduate, usually a fellow, responsible for the supervision of an undergraduate at some British universities.n. Law The legal guardian of a minor and of the minor's property.v. To act as a tutor to; instruct or teach privately.v. To have the guardianship, tutelage, or care of.verb-intransitive. To function as a tutor.verb-intransitive. To be instructed by a tutor; study under a tutor.