[ in-kloo-zhuhn ]
See synonyms for: inclusioninclusions on

  1. the act of including.

  2. the state of being included.

  1. something that is included.

  2. 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: Political and civic inclusion is vital to a sustainable democracy. Our company is committed to addressing issues of diversity and inclusion in the workplace.

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

  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 of inclusion

First recorded in 1590–1600; 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)

Other words from inclusion

  • non·in·clu·sion, noun
  • pre·in·clu·sion, noun
  • re·in·clu·sion, noun

Words Nearby inclusion Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use inclusion in a sentence

British Dictionary definitions for inclusion


/ (ɪnˈkluːʒən) /

  1. the act of including or the state of being included

  2. something included

  1. geology a solid fragment, liquid globule, or pocket of gas enclosed in a mineral or rock

  2. maths

    • the relation between two sets that obtains when all the members of the first are members of the second: Symbol: XY

    • strict inclusion or proper inclusion the relation that obtains between two sets when the first includes the second but not vice versa: Symbol: XY

  3. engineering a foreign particle in a metal, such as a particle of metal oxide

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012