Definition of inclusion
2
: something that is included: such as
a
: a gaseous, liquid, or solid foreign body enclosed in a mass (as of a mineral)
b
: a passive usually temporary product of cell activity (such as a starch grain) within the cytoplasm or nucleus
3
: a relation between two classes that exists when all members of the first are also members of the second — compare membership 3
4
: the act or practice of including students with disabilities in regular school classes
