What is the word for "understandable by specific group"?

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Music by Eric Matyas
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Track title: Puzzle Game 3 Looping

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Chapters
00:00 What Is The Word For &Quot;Understandable By Specific Group&Quot;?
00:16 Accepted Answer Score 11
00:40 Answer 2 Score 11
01:07 Answer 3 Score 1
01:32 Answer 4 Score 1
02:01 Thank you

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