Pronunciation: (fil'ing),[key] —n. 1. an act or instance of filling.
2. something that is put in to fill something else: They used sand as filling for the depression. 3. Dentistry.a substance such as cement, amalgam, gold, or the like, used to fill a cavity caused by decay in a tooth.
4. a food mixture that goes into something, as if to fill it: sandwich filling; pie filling. 5. Also called pick, weft, woof.Textiles.yarn carried by the shuttle and interlacing at right angles with the warp in woven cloth. See diag. under weave.