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Meaning of idioglossia

id•i•o•glos•si•a

Pronunciation: (id"ē-u-glos'ē-u, -glô'sē-u), [key]
— n.
  1. a private form of speech invented by one child or by children who are in close contact, as twins.
  2. a pathological condition characterized by speech so distorted as to be unintelligible.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.