WordReference Random House Unabridged Dictionary of American English © 2015
in•clu•sion  (in klo̅o̅zhən), 
  1. the act of including.
  2. the state of being included.
  3. something that is included.
  4. Cell Biology[Biol.]a body suspended in the cytoplasm, as a granule.
  5. Mineralogy[Mineral.]a solid body or a body of gas or liquid enclosed within the mass of a mineral.
  6. Geology, Rocks[Petrog.]xenolith.
  7. Mathematics, Philosophy[Logic, Math.]the relationship between two sets when the second is a subset of the first.
1945–50 for def. 7;
Latin inclūsiōn- (stem of inclūsiō) a shutting in, equivalent. to inclūs(us) (see incluse) + -iōn- -ion

WordReference Random House Learner's Dictionary of American English © 2015
in•clude /ɪnˈklud/USA pronunciation v. [+ object],-clud•ed, -clud•ing.
  1. [not: be + ~-ing] to contain or have as part of a whole:The meal includes dessert and coffee.
  2. to place (something) in a category:Whom would you include in your list?
in•clu•sion /ɪnˈkluʒən/USA pronunciationn. [uncountable]

Collins Concise English Dictionary © HarperCollins Publishers::

inclusion /ɪnˈkluːʒən/ n
  1. the act of including or the state of being included
  2. something included

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