noun

• (uncountable) A technical terminology unique to a particular subject.
  "That’s one of the biggest hurdles of managing a router and your network security in general, it’s a massive chore that is fraught with technical jargon, hurdles and screens saying ‘no’, ‘invalid’ or ‘not available’."
• (countable) A language characteristic of a particular group.
  "They [the Normans] abandoned their native speech, and adopted the French tongue, in which Latin was the predominant element. They speedily raised their new language to a dignity and importance which it had never before possessed. They found it a barbarous jargon; they fixed it in writing; and they employed it in legislation, in poetry, and in romance."
• (uncountable) Speech or language that is incomprehensible or unintelligible; gibberish.