Word for in-house jargon

Question

If a word or phrase is used and has evolved its own meaning peculiar to a specific group, is this described as jargon or is there a closer semantic match?

Answer 1

Yes, jargon usually has a meaning peculiar to a specific group. A synonym is intalk. Here's the Wiktionary definition for confirmation.

jargon

Noun

jargon (countable and uncountable; plural jargons)

1. (uncountable) A technical terminology unique to a particular subject.
2. (countable) Language characteristic of a particular group.
3. (uncountable) Speech or language that is incomprehensible or unintelligible; gibberish.

Synonyms (language characteristic of a group): argot, cant, intalk, slang vernacular

Answer 2

The definition of jargon refers to the vocabulary of a specific group:

the language, especially the vocabulary, peculiar to a particular trade, profession, or group

However, if the word or phrase developed to keep others out (that is, it was purposefully created as a kind of linguistic barrier) it might be classified as a cant:

Cant is the jargon, argot or cryptolect of a group, often implying its use to exclude or mislead people outside the group

Answer 3

On can also see term of art for some things like this. LINK

Answer 4

The word vernacular would work.

Answer 5

Argot

The jargon or slang of a particular class or group.