especially: the dialect or jargon spoken by a particular group
Sublanguage is a variety of language used in a particular field or by a particular professional group and characterized especially by distinctive vocabulary. Marina I. Solnyshkina
Examples of sublanguage include computer jargon and medical terminology … Encyclopedia of Library and Information Science
Jargon starts out as a simple technical sublanguage: users devise abbreviations and acronyms that help speed up processes. It also helps reinforce group solidarity … Baden Eunson