intermediary
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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.
adjective
intermediate:
〖名詞の前で〗仲介の, 中継の, 媒介する; 中間の.
e.g. an intermediary stage.
ORIGIN
late 18th century: from French intermédiaire, from Italian intermediario, from Latin intermedius (see intermediate).