jar ‧ gon /ˈdʒɑːɡən $ ˈdʒɑːrɡən, -ɡɑːn/ BrE AmE noun [uncountable]
[ Date: 1300-1400 ; Language: Old French ; Origin: jargoun ]
words and expressions used in a particular profession or by a particular group of people, which are difficult for other people to understand – often used to show disapproval ⇨ argot :
Keep it simple and avoid the use of jargon.
technical/scientific/legal/medical etc jargon
documents full of legal jargon