Unable to read or write, or lacking education and knowledge in a particular area.
From Latin 'illiteratus,' combining 'il-' (not) and 'literatus' (learned/lettered), literally meaning 'not lettered' or without written knowledge.
Throughout most of human history, being illiterate was completely normal—it's only in the last 150 years that widespread literacy became the global expectation, completely reshaping human civilization.
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