"intermediary role" is correct and usable in written English.
It is typically used to describe a role or position that serves as a mediator or in-between for two parties or entities. Example: The United Nations has played an intermediary role in the peace negotiations between the two warring countries.
The International Monetary Fund rejected the intermediary role in the aftermath of the financial crisis.
He said that the council was playing an intermediary role that could help defuse tensions between the two countries.
Were the latter moved there to effectively "pacify" the Mashco-Piros and facilitate operations - with missionaries playing an intermediary role?
As a digital currency, it effectively bypasses the intermediary role of banks, with their expensive credit cards and high processing costs.
Banks' sales-and-trading, market-making function — the intermediary role — is no longer profitable enough to support the whopping paychecks of the firm's employees.
The United States would play the intermediary role; Baghdad must always be a robust participant in regional talks and share in leadership.
They are also a critical component of Syria's connection to Russia and the West, serving an intermediary role through their relations with the global Armenian diaspora.
The Syrian opposition's political arm complained about the intermediary role of the Lebanese, and asked the Saudis to deal with the opposition more directly.
For a time Murcia played an intermediary role between the Almoravids and the Castilians, but in the end religious sympathies inclined it to the Almoravids.
Asking the United States to play an intermediary role with Taiwan breaks a longstanding taboo in Beijing, where officials have often criticized Washington for meddling in relations between China and Taiwan.
But he also hinted the duke's office should cease its intermediary role on Sunninghill saying: "I think I should now deal direct with the incoming purchasers on any detail relating to the site".
