The term "filling" can refer to several different meanings depending on the context in which it is used.
1) In a general sense, filling refers to something that fills or completes an area or space. For example, when referring to food, filling could describe a sandwich filled with meat and cheese, or a cake filled with frosting.
2) Filling can also refer to the act of providing someone or something with what is needed to complete a task or fulfill a need. In this context, it might mean supplying materials for construction work, or giving information that fills in missing details about an event.
3) Finally, filling could be used in reference to dental care, where it means the process of restoring a damaged or decayed tooth with a material such as metal, porcelain or resin. This type of filling is designed to repair and protect the tooth from further damage.