What does jargon mean in literature?

Answer 1

Jargon is the slang usages or idioms restricted to a particular field of employment

Answer 2

In literature, jargon refers to specialized terminology or language used by a particular group or profession that may be difficult for those outside the group to understand. It can create a sense of authenticity or realism in a text when used appropriately, but can also be exclusionary if overused or not explained to the reader.