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

1590–1600; 1945–50 for def 7; < Latin inclūsiōn- (stem of inclūsiō) a shutting in, equivalent to inclūs(us) (see incluse) + -iōn- -ion

noninclusion, noun
preinclusion, noun
reinclusion, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
inclusion (ɪnˈkluːʒən)
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
 a.  XY the relation between two sets that obtains when all the members of the first are members of the second
 b.  strict inclusion, proper inclusion XY the relation that obtains between two sets when the first includes the second but not vice versa
5.  engineering a foreign particle in a metal, such as a particle of metal oxide

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American Heritage
Medical Dictionary

inclusion in·clu·sion (ĭn-klōō'zhən)

  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.

The American Heritage® Stedman's Medical Dictionary
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