inclusion: Meaning and Definition of

in•clu•sion

1. the act of including.
2. the state of being included.
3. something that is included.
4. a body suspended in the cytoplasm, as a granule.
5. a solid body or a body of gas or liquid enclosed within the mass of a mineral.
6. xenolith.
7. the relationship between two sets when the second is a subset of the first.