Pronunciation: (pij'un), [key]
1. an auxiliary language that has come into existence through the attempts by the speakers of two different languages to communicate and that is primarily a simplified form of one of the languages, with a reduced vocabulary and grammatical structure and considerable variation in pronunciation.
2. (loosely) any simplified or broken form of a language, esp. when used for communication between speakers of different languages.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.