Definitions
1.NounA product of mixing and reacting two or more substances (causing reaction); mixture causing chemical transformation or change; the interaction of entities :
the state resulting from such a reaction
a process involving change in atomic nuclei
2.Nounthe state resulting from such a reaction
3.Nouna process involving change in atomic nuclei
4.NounA product formed by the combination of two or more elements, compounds or substances together causing reactions and transformation of original items or substances.