The definition of illiteracy is lack of knowledge in a particular subject or is the inability to write and read.
(noun)When a person is not able to read even simple books and is not able to write anything more than his own name, this is an example of illiteracy.
See illiteracy in Webster's New World College Dictionary
noun
See illiteracy in American Heritage Dictionary 4
noun pl. il·lit·er·a·cies
Learn more about illiteracy