inclusion

American  

[in-kloo-zhuhn] / ɪnˈklu ʒən /

noun

1. the act of including.

2. the state of being included.

3. something that is included.

4. the practice or policy of including and integrating all people and groups in activities, organizations, political processes, etc., especially those who are disadvantaged, have suffered discrimination, or are living with disabilities: Our company is committed to addressing issues of diversity and inclusion in the workplace.

   Political and civic inclusion is vital to a sustainable democracy.

   Our company is committed to addressing issues of diversity and inclusion in the workplace.

5. the educational policy of placing students with physical or mental disabilities in regular classrooms and providing them with certain accommodations.

6. Biology. a body suspended in the cytoplasm, as a granule.

7. Mineralogy. a solid body or a body of gas or liquid enclosed within the mass of a mineral.

8. Petrography. xenolith.

9. Logic, Mathematics. the relationship between two sets when the second is a subset of the first.

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inclusion British  

/ ɪnˈkluːʒən /

noun

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.  X⊆Y.  the relation between two sets that obtains when all the members of the first are members of the second

   2.  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

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Other Word Forms

Derived Forms

• reinclusion
  noun
• noninclusion
  noun
• preinclusion
  noun

Etymology

Origin of inclusion

First recorded in 1590–1600; inclusion def. 9 was first recorded in 1945–50; from Latin inclūsiōn- (stem of inclūsiō ) “a shutting in,” equivalent to inclūs(us) ( see incluse) + -iōn- noun suffix ( see -ion)

Explanation

Inclusion is the act of including someone in something, like a school, club, or team. If you are familiar with the word include — meaning to make someone or something a part of something larger — then inclusion should make sense. You might be happy at your inclusion on the school's volleyball team. The inclusion of an actor in a movie is exciting. When there's a new President, people wait and see who will earn inclusion in the cabinet. In biology, an inclusion body is a very small body found within another on the cellular level.

Example Sentences

Marvell Technology and Flex rise following news of their inclusion in the S&P 500 on June 22.

From Barron's • Jun. 8, 2026

Asking him to choose sides runs contrary to decades of Sesame Street lessons about kindness, friendship and inclusion.

From Salon • Jun. 7, 2026

So any politician, Steyer included, who fights for inclusion rather than accepting exclusion will get my consideration.

From Los Angeles Times • Jun. 7, 2026

The Durham man justified his inclusion to replace the dropped Zak Crawley by becoming the first England opener to score a half-century on debut in a home Test since 2004.

From BBC • Jun. 5, 2026

I didn’t go out for inclusion classes all day—I wanted to study until the last minute—but as soon as the last bell rings, I grab Catherine’s arm.

From "Out of My Mind" by Sharon M. Draper

Related Words

• admittance
• formation
• incorporation
• involvement