The noun jargon has 3 senses (first 1 from tagged texts)
1. (1) slang, cant, jargon, lingo, argot, patois, vernacular -- (a characteristic language of a particular group (as among thieves); "they don't speak our lingo")
2. jargoon, jargon -- (a colorless (or pale yellow or smoky) variety of zircon)
3. jargon -- (specialized technical terminology characteristic of a particular subject)