in·clu·sion

[in-kloo-zhuhn]
noun
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.
Origin:
1590–1600; 1945–50 for def 7; < Latin inclūsiōn- (stem of inclūsiō) a shutting in, equivalent to inclūs(us) (see incluse) + -iōn- -ion

Related forms
non·in·clu·sion, noun
pre·in·clu·sion, noun
re·in·clu·sion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Inclusion is always a great word to know.
So is gamete. Does it mean:
a mature sexual reproductive cell, such as a sperm or egg, that unites with another cell to form a new organism
a sudden departure from the parent type an heritable characteristic caused by a change in a gene or a chromosome
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Collins
World English Dictionary
inclusion (ɪnˈkluːʒən) [Click for IPA pronunciation guide]
 
—n
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.  X⊆Y the relation between two sets that obtains when all the members of the first are members of the second
 b.  strict inclusion, proper inclusion X⊂Y 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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

inclusion in·clu·sion (ĭn-kl&oomacr;'zhən)
n.

  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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The résumé looks much better with the addition of bullet points and the
  inclusion of relevant employment experience.
Measured against such rigid, cookie-cutter standards, not many of us qualify
  for inclusion in the festivities.
Even with random sampling, people in the population have unequal probabilities
  of inclusion in the survey.
The inclusion of subs will require some modifications to the publisher's game
  engines, it said.
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