Jargon (noun)

Special words or expressions that are used by a particular profession or group and are difficult for others to understand.

Origin:

Mid 16th century: from old french, of uncertain origin; compare with old norse geirr "spear" and old english gar "spear".

Examples:

1. The article was filled with jargon that was difficult for a layperson to understand.
2. The medical jargon used in the report made it hard for the patient to understand the diagnosis.
3. The legal jargon used in the contract made it hard for the client to understand the terms.
4. The computer jargon used in the manual made it hard for the user to understand the instructions.
5. The financial jargon used in the presentation made it hard for the investors to understand the proposal.