The Collaborative International Dictionary of English v.0.48:

Segregation \Seg`re*ga"tion\, n. [L. segregatio: cf. F.
   s['e]gr['e]gation.]
   1. The act of segregating, or the state of being segregated;
      separation from others; a parting.
      [1913 Webster]

   2. (Geol.) Separation from a mass, and gathering about
      centers or into cavities at hand through cohesive
      attraction or the crystallizing process.
      [1913 Webster]

WordNet (r) 3.0 (2006):

segregation
    n 1: (genetics) the separation of paired alleles during meiosis
         so that members of each pair of alleles appear in different
         gametes
    2: a social system that provides separate facilities for
       minority groups [syn: segregation, separatism]
    3: the act of segregating or sequestering; "sequestration of the
       jury" [syn: segregation, sequestration] [ant:
       desegregation, integrating, integration]