Main Entry: in·clu·sion

Pronunciation: \in-ˈklü-zhən\

Function: noun

Etymology: Latin inclusion-, inclusio, from includere

Date: 1600

1 : the act of including : the state of being included
2 : something that is included: 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 (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

— in·clu·sion·ary \in-ˈklü-zhə-ner-ē\ adjective