Which term describes informal language specific to a particular group?

The term that best describes informal language specific to a particular group is "slang." Slang encompasses informal, often non-standard words and expressions used within a specific community or social group. This type of language is typically characterized by its playful and creative use of vocabulary, reflecting trends, cultural references, or in-group dynamics.

Slang can evolve quickly and often changes with time, which is why terms that may be widely used in one generation could fall out of favor in the next. It serves not only as a means of communication but also as a badge of identity among members of the group that uses it, fostering a sense of belonging and shared understanding.

While jargon refers to specialized language used within particular professions or fields, dialects are variations of language that include distinct vocabulary and grammar used by specific regional or social groups. Colloquialisms are casual expressions or sayings that may not be formal but do not necessarily imply the same degree of informality or exclusiveness as slang. Thus, slang is the most fitting term for informal language that is specific to a particular group.