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Webster 1913 Edition

Noun.

Lack of learning; illiteracy.

[R.]

Ayliffe. Southey.

Noun.

Want of learning. [Little used.]

illiterature ‎(uncountable)

(archaic) Lack of learning; illiteracy.
- 1839, The Commercial and General Lawyer
  If the presentee of a lay patron be refused by the ordinary, in most cases (as for simony, adultery, or illiterature) the patron is entitled to notice; […]