In another thread I used the word jargon, with an intent solely related to definition 3. The brief WRF (OED based) dictionary provides only definition 3, and that is the only usage I am familiar with (given my BrE background?). The other definitions support the notion that referring to something as "jargon" has a pejorative intent. I wonder whether I just led a sheltered life or whether there are others who do not automatically think "pejorative" when they hear the word in isolation or in writing. Clearly, the context where it is used could carry the nuance, as could tone, but absent that guidance, do you think that way? Is this a BrE AmE thing, given the absence from the WRF definition of the definitions other than 3 below? Perhaps it is because my career was in a sphere dependent on scientific words that were very specialized, that I accept the term as neutral.
Jargon n.1. Nonsensical, incoherent, or meaningless talk.
2. A hybrid language or dialect; a pidgin.
3. The specialized or technical language of a trade, profession, or similar group. See Synonyms at dialect.
4. Speech or writing having unusual or pretentious vocabulary, convoluted phrasing, and vague meaning.