Definition: In the culinary arts, the word Simmer means to cook a food in liquid with a temperature ranging from 180°F to 205°F. Simmering is a cooking technique that's used when making stocks or soups, starchy items like potatoes or pastas, and many other culinary preparations.With simmering you'll see bubbles forming and gently rising to the surface of the water, but the water is not yet at a full rolling boil.
See Also: Poach, Boil