Accent - A seasoning also called MSG (Monosodium Glutamate). It is commonly used in Oriental cooking. It is not a favored seasoning or enhancer in the United States as many people are allergic to it. It is an optional seasoning and can very easily be left out of recipes.
MSG is the sodium salt of the amino acid glutamic acid and a form of glutamate. It is sold as a fine white crystal substance, similar in appearance to salt or sugar. It does not have a distinct taste of its own, and how it adds flavor to other foods is not fully understood. Many scientists believe that MSG stimulates glutamate receptors in the tongue to augment meat-like flavors.
(What's Cooking America