Doneness is a gauge of how thoroughly cooked a cut of meat is based on the color, juiciness and internal temperature when cooked. The gradations of cooking are most often used in reference to beef (especially steak and roasts) but are also applicable to lamb, pork, poultry, veal and seafood (especially fish).
Gradations, their description, and the associated temperature ranges vary regionally from cuisine to cuisine and in local practice and terminology. The table below is from an American reference book[1] and pertains to beef and lamb.
In lieu of gradations and ranges, the United States Department of Agriculture recommends a temperature of at least 63 °C (145 °F) for beef, veal, lamb steaks and roasts in order to prevent foodborne illness.[2]