Meaning

• An addition or annex to a group, set, or total.

  "The poem was a new inclusion in the textbook."

• The act of including, i.e. adding or annexing, (something) to a group, set, or total.

  "The inclusion of the poem added value to the course."

• 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.