Source : Webster's Revised Unabridged Dictionary (1913)

Inclusion \In*clu"sion\, n. [L. inclusio: cf. F. inclusion. See
   {Include}.]
   1. The act of including, or the state of being included;
      limitation; restriction; as, the lines of inclusion of his
      policy. --Sir W. Temple.

   2. (Min.) A foreign substance, either liquid or solid,
      usually of minute size, inclosed in the mass of a mineral.

Source : WordNet®

inclusion
     n 1: the state of being included [ant: {exclusion}]
     2: the relation of comprising something; "he admired the
        inclusion of so many ideas in such a short work" [syn: {comprehension}]
     3: any small intracellular body found within another
        (characteristic of certain diseases); "an inclusion in the
        cytoplasm of the cell" [syn: {inclusion body}, {cellular
        inclusion}]
     4: the act of including