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An idioglossia is an idiosyncratic language invented and spoken by only one person or very few people. Most often, idioglossia refers to the "private languages" of young children, especially twins, the latter being more specifically known as cryptophasia, and commonly referred to as twin talk or twin speech.

Children who are exposed to multiple languages from birth are also inclined to create idioglossias, but these languages usually disappear at a relatively early age, giving way to use of one or more of the languages introduced.


Case studies[edit]


See also[edit]

  • Argots, secret languages used to prevent others from understanding conversations
  • Home sign, a similar phenomenon among sign languages


  1. ^ Moisse, Katie (March 30, 2011). "Babies Learn How Conversation Works Before They Learn Words". ABC News.
  2. ^ jayrandall22011 (14 February 2011). "Talking Twin Babies - PART 2 - OFFICIAL VIDEO" – via YouTube. 

Further reading[edit]