Definition - The act of inventing an artificial language.

Example -
Zamenhof's Esperanto

Etymology -
The word, which means "the making of tongues" in Greek, was coined by J.R.R. Tolkien. I believe it made its first public appearance in Tolkien's A Secret Vice, a 1931 lecture, the vice being the desire to invent languages.

Oxford English Dictionary -
There is no OED entry for this word.

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