noun
Refers to a person who acts as an intermediary in business, negotiations, or introductions. Slightly formal and somewhat dated; in modern contexts, 仲介人 or 代理人 may be more common.
彼は貿易の周旋人として長年働いてきた。
He has worked for many years as a trade agent.
周
We signed the contract with that company through a middleman.
代理人 specifically refers to a legal or authorized representative, whereas 周旋人 is a broader term for a go-between or agent in commercial or personal matters.
Composed of 周旋 (しゅうせん, 'mediation, good offices') and 人 (にん, 'person'). The exact historical derivation is uncertain, but the term has been used since at least the early modern period to denote a professional intermediary.