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From Merriam-Webster: Etymology: Middle English, from Middle French

1. • Confused unintelligible language

• A strange, outlandish, or barbarous language or dialect
• hybrid language or dialect simplified in vocabulary and grammar and used for communication between peoples of different speech

3. The technical terminology or characteristic idiom of a special activity or group
4. Obscure and often pretentious language marked by circumlocutions and long words

From the Writer's Market: Words used primarily by members of a particular social, professional or other group. For example, medical jargonwords that are used to describe anatomy, disorders and various diagnostic, laboratory or other proceduresis generally unfamiliar to laypeople. Similarly, writers' jargon includes words and abbreviations such as kill fee, on spec and SASE. Like any dialect, jargon evolves within a subgroup of a larger culture to aid communication about the subgroup's specialized needs; the problem with jargon arises when members of the subgroup, in speaking with (or writing for) the general public, either consciously or unconsciously use jargon to confuse, exclude or exploit the nonmemberas when a doctor, for instance, neglects to explain a painful or risky treatment to a patient in terms he can grasp.