The phrase "compact segment" refers to a small and condensed part of something, typically used in reference to a specific area or portion within a larger whole. Full definition
We created the premium compact segment in 1996 with the very first A3, and since then, almost 18,000 Australian customers have chosen to own one. (ausmotive.com)
Whether in comparison tests, on the race track or in everyday use, it has traditionally set the benchmark in the sporting compact segment. (topspeed.com)
Although it's slightly cheaper than the outgoing model, it's decidedly more modern inside the cabin and has enough features to tackle the upper market of the affordable compact segment. (topspeed.com)