1. [n]  a person who gives private instruction (as in singing or acting)
2. [v]  be a tutor to someone; give individual instruction; "She tutored me in Spanish"
3. [v]  act as a guardian to someone

1. \Tu"tor\, n. [OE. tutour, L. tutor, fr. tueri to watch,
   defend: cf. F. tuteur. Cf. {Tuition}.]
   One who guards, protects, watches over, or has the care of,
   some person or thing. Specifically:
   (a) A treasurer; a keeper. ``Tutour of your treasure.''
       --Piers Plowman.
   (b) (Civ. Law) One who has the charge of a child or pupil and
       his estate; a guardian.
   (c) A private or public teacher.
   (d) (Eng. Universities) An officer or member of some hall,
       who instructs students, and is responsible for their
       discipline.
   (e) (Am. Colleges) An instructor of a lower rank than a
       professor.
   

2. \Tu"tor\, v. t. [imp. & p. p. {Tutored}; p. pr. & vb. n.
   {Tutoring}.]
   1. To have the guardianship or care of; to teach; to
      instruct.
            Their sons are well tutored by you.   --Shak.
   2. To play the tutor toward; to treat with authority or
      severity. --Addison.
   

A Scripting language on PLATO systems from CDC.

["The TUTOR Language", Bruce Sherwood, Control Data, 1977].