Inclusion meaning : An addition or annex to a group, set, or total. The act of including, i.e. adding or annexing, (something) to a group, set, or total. Anything foreign that is included in a material, Any material that is trapped inside a mineral during its formation, as a defect in a precious stone. A nuclear or cytoplasmic aggregate of stainable substances. An object completely inside a tissue, such as epidermal inclusion cyst, a cyst in the epidermis. A mapping where the domain is a subset of the image. Restriction; limitation.