fill·ing / ˈfiling/ • n. a quantity of material that fills or is used to fill something: a cushion with polyester filling. ∎ a piece of material used to fill a cavity in a tooth: a gold filling. ∎ an edible substance placed between the layers of a sandwich, cake, or other foodstuff: a Swiss roll with a chocolate filling. ∎ another term for weft.• adj. (of food) leaving one with a pleasantly satiated feeling: a filling spicy bean soup.