Definition of "Filling" :

noun: the act of filling something

noun: (dentistry) a dental appliance consisting of any of various substances (as metal or plastic) inserted into a prepared cavity in a tooth

"When he yawned I could see the gold fillings in his teeth."

noun: the yarn woven across the warp yarn in weaving

noun: a food mixture used to fill pastry or sandwiches etc.

noun: flow into something (as a container)

noun: any material that fills a space or container