名詞 intermediary:

1. a negotiator who acts as a link between parties
   同義詞：mediator, go-between, intermediator, intercessor

1. They disliked each other too much to meet, so they conducted all their business through an intermediary.
   他們彼此交惡不愿相見，有事均通過中間人處理。

in.ter.me.di.ar.y

adj.（形容詞）
Existing or occurring between; intermediate.
中間的：在…之間存在或發(fā)生的；居間的
Acting as a mediator or an agent between persons or things.
調解的：在人或事物之間充當調解人或中介的
n.（名詞）
【復數】 in.ter.me.di.ar.ies
One that acts as a mediator.
調解人：充當調解人的人
One that acts as an agent between persons or things; a means.
媒介：在人或事物之間充當中介的人；一種手段
An intermediate state or stage.
中間狀態(tài)：中間形態(tài)或中間階段

來源：
Probably French intermédiaire
可能為 法語 intermédiaire
from Late Latin intermedius [intermediate] * see intermediate
源自 后期拉丁語 intermedius [中間的] *參見 intermediate