What is the meaning of Casserole?

A dish of glass or earthenware, with a lid, in which food is baked and sometimes served.

Food, such as a stew, cooked in such a dish.

Any type of food that fills the high-walled dish or pan in which it was cooked. (Can we add an example for this sense?)

To cook like, or as, a casserole; to stew.

saucepan (utensil)

saucepan (contents of a saucepan)

stewpot, cooking pot

Source: wiktionary.org