A turnkey business is a reference to a type of business, wherein the owner can simply enter the building, unlock the door, and begin selling a product or service.

The Turnkey internet business is a business that you can buy and start immediately. However, it is important to watch out for scams when purchasing these turnkey businesses.

I just found the explanation of "turnkey" and I am not sure the meaning of "turnkey procurement", it might be something similar, hope the following words helpful to you. "This term may be used to advertise the sale of an established business, including all the equipment necessary to run it, or by a business-to-business supplier providing complete packages for business start-up. An example would be the creation of a "turnkey hospital" which would be building a complete medical center with installed high-tech medical equipment."----- From Wikipedia

One that is essentially ready to do business immediately. Just "turn the key" and go.

Non-turnkey and turnkey projects are the opposite of each other. Turnkey projects are those that contract a firm to fully design, construct and equip a project and then turn it over to the purchaser.