All 4 Uses

jargon
in
The Hunchback of Notre Dame
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"Vagabond, Aesopus certainly was; Homerus was a beggar; Mercurius was a thief—" Clopin interrupted him: "I believe that you are trying to blarney us with your jargon.†
Chpt 1.2.6

jargon = specialized vocabulary
Hence, the "public prosecution" satisfied, as the bigwigs of the law still express it in their jargon, the turn came of a thousand private vengeances.†
Chpt 1.6.4 *
From all these countries the young girl had brought back fragments of queer jargons, songs, and strange ideas, which made her language as motley as her costume, half Parisian, half African.†
Chpt 2.7.2
There was also Hebrew jargon, of which Jehan, who as yet knew but little Greek, understood nothing; and all were traversed in every direction by stars, by figures of men or animals, and by intersecting triangles; and this contributed not a little to make the scrawled wall of the cell resemble a sheet of paper over which a monkey had drawn back and forth a pen filled with ink.†
Chpt 2.7.4

jargon = specialized vocabulary

Definitions:

(1) (jargon)
words or expressions commonly used in a particular field but not understood by most people
(2) (meaning too rare to warrant focus)
Much less commonly, jargon can reference nonsensical use of words.