1. the act of including.
  2. the state of being included.
  3. something that is included.
  4. Biology. a body suspended in the cytoplasm, as a granule.
  5. Mineralogy. a solid body or a body of gas or liquid enclosed within the mass of a mineral.
  6. Petrography. xenolith.
  7. Logic, Mathematics. the relationship between two sets when the second is a subset of the first.


  1. the act of including or the state of being included
  2. something included
  3. geology a solid fragment, liquid globule, or pocket of gas enclosed in a mineral or rock
  4. maths
    1. the relation between two sets that obtains when all the members of the first are members of the secondSymbol: XY
    2. strict inclusion or proper inclusionthe relation that obtains between two sets when the first includes the second but not vice versaSymbol: XY
  5. engineering a foreign particle in a metal, such as a particle of metal oxide

c.1600, from Latin inclusionem (nominative inclusio) “a shutting up, confinement,” noun of action from past participle stem of includere (see include).


  1. A nonliving mass, such as a droplet of fat, in the cytoplasm of a cell.
  2. The process by which a foreign or heterogenous structure is misplaced in another tissue.

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