1. (Dentistry) Any of various substances (as metal or plastic) inserted into a prepared cavity in a tooth; an inform British term for 'filling' is 'stopping'.
2. A act of filling something.
3. A food mixture used to fill pastry or sandwiches.
4. Any material that fills a space or container; SYN. fill.
5. The act of flowing into something (as a container) to make it full.