The Collaborative International Dictionary of English v.0.48:

Illiterate \Il*lit"er*ate\, a. [L. illiteratus: pref. il- not +
   literatus learned. See In- not, and Literal.]
   Unable to read or write; ignorant of letters or books;
   unlettered; uninstructed; uneducated; as, an illiterate man,
   or people.

   Syn: Ignorant; untaught; unlearned; unlettered; unscholary.
        See Ignorant. -- Il*lit"er*ate*ly, adv. --
        Il*lit"er*ate*ness, n.
        [1913 Webster]