Many documents introduce or use jargon, terms that mean something new or different from how the term is normally used. Wikipedia defines jargon as “a type of language that is used in a particular context and may not be well understood outside of it”.
When using jargon, there is the question of when to define it. Defining jargon early ensures you don’t waste readers’ time. It is tedious to read an article that adds no new insight other than a new phrase coined by an author for the sake of their argument.