Definition of jar on:
(n) :
(uncountable) A technical terminology unique to a particular subject.
(n) :
(countable) A language characteristic of a particular group.
(n) :
(uncountable) Speech or language that is incomprehensible or unintelligible; gibberish.
(v) :
To utter jargon; to emit confused or unintelligible sounds.
(n) :
Alternative form of jargoon (“A variety of zircon”). [A variety of zircon.]