illiteracyPronunciation: /ɪˈlɪt(ə)rəsi/Translate illiteracy | into German | into Italian | into Spanish Definition of illiteracy noun [mass noun] the inability to read or write:the ineffective educational system meant that illiteracy was widespread lack of knowledge in a particular subject; ignorance:his economic illiteracyilliteracy in other Oxford dictionaries Definition of illiteracy in the US English dictionary