adj. 1.  a.  Unable to read and write. b.  Having little or no formal education. 2.  a.  Marked by inferiority to an expected standard of familiarity with language and literature: an illiterate magazine. b.  Violating prescribed standards of speech or writing: a paragraph with several illiterate expressions. 3.  Ignorant of the fundamentals of a given art or branch of knowledge: musically illiterate. See Usage Note at  literate. n. 1.  A person who is illiterate. 2.  (used with a pl. verb) People who are illiterate, considered as a group. il·liter·ate·ly adv. il·liter·ate·ness n.  | 
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