Webster’s 1828 dictionary definition of "illiterate."
Noah Webster and Hezekiah Howe, "Illiterate," An American Dictionary of the English Language, (New York: S. Converse, 1828), vol. 1., p. 104
ILLIT'ERACY, n. {noun} [from illiterate.] The state of being untaught or unlearned; want of a knowledge of letters; ignorance.
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ILLIT'ERATE, a. {adjective} [Latin illiteratus; in and literatus; from litera, a letter.] Unlettered; ignorant of letters or books; untaught; unlearned; uninstructed in science; as an illiterate man, nation or tribe.
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ILLIT'ERATENESS, n. {noun} Want of learning; ignorance of letters, books of science.