source: [俺の妹がこんなに可愛いわけがない‎の高坂京介が喧嘩の仲裁をするGIF画像｜無料GIF画像検索 GIFMAGAZINE 659913]

noun (plural intermediaries)

a person who acts as a link between people in order to try to bring about an agreement or reconciliation; a mediator:

仲介者, 仲裁人; 媒介物, 媒介の手段; 中間段階

e.g. intermediaries between lenders and borrowers.

intermediate:

〖名詞の前で〗仲介の, 中継の, 媒介する; 中間の.

e.g. an intermediary stage.

late 18th century: from French intermédiaire, from Italian intermediario, from Latin intermedius (see intermediate).