In a quite ordinary sense, it is obvious that there can be private languages. There can be, because there are. A language may be said to be private when it is devised to enable a limited number of persons to communicate with one another in a way that is not intelligible to anyone outside the group. By this criterion, thieves’ slang and family jargons are private languages. Such languages are not strictly private, in the sense that only one person uses and understands them, but there may very well be languages that are. Men have been known to keep diaries in codes-which no one else is meant to understand. A private code is not, indeed, a private language, but rather a private method of transcribing some given language. It is, however, possible that a very secretive diarist may not be satisfied with putting familiar words into an unfamiliar notation, but may prefer to invent new words : the two processes are in any case not sharply distinct. If he carries his invention far enough he can properly be said to be employing a private language. For all I know, this has actually been done.
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