Definitions
Wiktionary
- n. An invented form of dialect, language, or speech used by children, typically twins, and intelligible only to its speakers.
Examples
“Anyway, all signs point to them exhibiting the wonderful weirdness of twins doing the secret-language thing aka idioglossia.”
“Loc: idioglossia R.: R. Kelly - "Pregnant" w/Tyrese/theDream/R.bin Thik”
“Loc: idioglossia Re: The Who Dat Nation Parties Like No Other”
“Loc: idioglossia Re: Resin Dogs drummer joins Wolfmother SoulOnIce”
“Loc: idioglossia Re: Resin Dogs drummer joins Wolfmother”
Lists
These user-created lists contain the word ‘idioglossia’.
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Word Words
This used to be my nym list, but there are so many words about words, I think it's time to expand and open.
acronym, antonym, aptronym, autoantonym, autonym, bacronym, capitonym, contranym, contronym, eponym, exonym, heteronym and 120 more...
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Logolepsy
"Luciferous Logolepsy is a collection of over 9,000 obscure English words. Though the definition of an 'English' word might seem to be straightforward, it is not. There exist so many adopted, deriv...
Anschauung, Areopagus, Argus, Briarean, Dei gratia, Dei judicium, Deo volente, Duecento, Foehn, Geflugelte Worte, Gegenschein, Hakenkreuz and 9230 more...
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I didn't know there was a word for that!
interdigitate, aspheric, benthos, reptation, pastiche, pandiculate, agelast, obdormition, dysania, armscye, phosphene, etiolation and 56 more...
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Words about Words
backronym, contranym, haplology, enallage, paronomasia, omniana, scripturient, ambigram, idioglossia, dysphemism, tmesis, panvocalic and 6 more...
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Neologistics
Basically this is a "words about words" list with a focus on neologism generation in all its various forms.
wordplay, paronomasia, madeupical, logodaedaly, onomatopoeic, verbification, nominalization, recontextualization, spoonerism, typo recycling, sloganeer, wordsmith and 59 more...

oroboros Indeed it is! Wittgenstein must be spinning in his grave! Jun 28, 2010
reesetee Fascinating. Apr 16, 2009
bilby A fine example here. Apr 15, 2009
mollusque The ease of their conversation confused him. They spoke in the compressed, comic shorthand of people who'd known each other from childhood. Idioglossia, as shared as any. They picked at a deep-fat-fried onion, chatting without having to explain themselves.
--Richard Powers, 2007, The Echo Maker, p. 319 Nov 7, 2008
whichbe Secret speech or language, especially invented by children; psychological condition in which speech is so distorted as to be unintelligible. May 15, 2008