A person who acts as a mediator, intermediary, or witness in business transactions or disputes; also known as an 中间人 zhōng​jiān​rén

A person of ordinary stature, appearance, ability, or social standing; someone who is average or mediocre

(bound form) A palace eunuch or an official working within the inner palace

(bound form) A woman working in the internal service of the imperial palace

(literary) A household with a medium level of wealth or social standing; also known as a 中户 zhōng​hù

(literary) A person in the inner circle of a ruler or official who is highly trusted and influential