intermediary

noun

1
An agent acting as a mediator between sides that may disagree.
2
An arranger of a contract or other agreement who is separate from the parties to the agreement
3
One or several stages of an event which occurs after the start and before the end.
4
A person or organisation in an intermediate position in a supply chain of goods or services
“The intermediary between the manufacturer and retailer is the wholesaler”

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