Noun
(computing) A subset of a language, in particular of a programming language.
(linguistics) A language restricted to a specific context, such as a particular subject area.
the sublanguage of weather bulletins
The R5RS standard introduced a powerful hygienic macro system that allows the programmer to add new syntactic constructs to the language using a simple pattern matching sublanguage (R5RS sec 4.3). Source: Internet
Common Lisp citation provides a Loop macro which implements such a sublanguage. Source: Internet
Loop sublanguage Some Lisp dialects are providing an extensive sublanguage for describing Loops. Source: Internet