Source : Webster's Revised Unabridged Dictionary (1913)

Illiterate \Il*lit"er*ate\, a. [L. illiteratus: pref. il- not +
   literatus learned. See {In-} not, and {Literal}.]
   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.

Source : WordNet®

illiterate
     adj 1: not able to read or write [ant: {literate}]
     2: ignorant of the fundamentals of a given art or branch of
        knowledge; "ignorant of quantum mechanics"; "musically
        illiterate" [syn: {ignorant}]
     n : a person unable to read [syn: {illiterate person}, {nonreader}]