"separate agreement" is correct and usable in written English.
An example of using "separate agreement" might be: "The two parties involved in the negotiation agreed to sign a separate agreement."
"It is a separate agreement," he said.
(Slot machines are covered under a separate agreement).
Without an extension of the resolution or a separate agreement with the Iraqis, American troops would have to cease operations.
In a separate agreement, it also gave Johnson & Johnson the rights to sell the drug for all uses overseas.
BP also retains hopes of clinching a separate agreement to develop non-associated or "deep gas" at the ACG fields.
A separate agreement calls for Liberty to receive about $25 million if The Star Bulletin is sold.
All sides will also benefit from a separate agreement that will divvy up scarce water flows in the Klamath.
But Coca-Cola is expected to keep supplying products to those Applebee's restaurants under a separate agreement.
Verizon also made a separate agreement that would allow the cable companies to market Verizon services and vice versa.
The carrier also made a separate agreement that would allow the cable companies to market Verizon services, and vice versa.
Writers from "The Office," including Greg Daniels, an executive producer, have objected to that and refused to work on further shorts without a separate agreement.
