Webster's English Dictionary

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inclusion

in.clu.sion \in-'klu:-zh*n\ n [L inclusion-, inclusio, fr. inclusus, pp. of 
   includere] 1: the act of including : the state of being included  2: 
   something that is included : as  2a: a gaseous, liquid, or solid foreign 
   body enclosed in the mass of a mine ral 2b: a passive product of cell 
   activity (as a starch grain) within the proto plasm