Webster’s Dictionary:

noun    

1. The language, especially the vocabulary, peculiar to a particular trade, profession, or group: medical jargon.

2. Unintelligible or meaningless talk or writing; gibberish.

3. Any talk or writing that one does not understand.

4. Pidgin.

5. Language that is characterized by uncommon or pretentious vocabulary and convoluted syntax and is often vague in meaning.