All 3 Uses

jargon
in
Politics and the English Language
(Auto-generated)

[Note 1, below] The jargon peculiar to Marxist writing (HYENA, HANGMAN, CANNIBAL, PETTY BOURGEOIS, THESE GENTRY, LACKEY, FLUNKEY, MAD DOG, WHITE GUARD, etc.) consists largely of words and phrases translated from Russian, German or French; but the normal way of coining a new word is to use a Latin or Greek root with the appropriate affix and, where necessary, the '—ize' formation†

jargon = specialized vocabulary
When one critic writes, "The outstanding feature of Mr. X's work is its living quality," while another writes, "The immediately striking thing about Mr. X's work is its peculiar deadness," the reader accepts this as a simple difference of opinion If words like BLACK and WHITE were involved, instead of the jargon words DEAD and LIVING, he would see at once that language was being used in an improper way.†
(v) Never use a foreign phrase, a scientific word or a jargon word if you can think of an everyday English equivalent†
*

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.