A piece ofcookware that has straight sides and a large surface area, both of which are ideal for tasks like searing meat or reducing a pan sauce.
2002, Deborah Krasner,The Flavors of Olive Oil: A Tasting Guide and Cookbook, page53:
Although a cast-iron frying pan will brown food extremely well (and can serve if you don't want to buy asaute pan), asaute pan has higher, straighter sides and is available in large sizes.