noun which may take the genitive case particle 'no', noun
large, medium, and small
Used to classify or describe three sizes, often in business contexts (companies, rooms, packages, etc.).
このホテルには大中小の会議室があります。
This hotel has large, medium, and small meeting rooms.
大中小の企業を対象に調査を行った。
We conducted a survey targeting large, medium, and small businesses.