The Collaborative International Dictionary of English v.0.48:

desegregation \de`seg*re*ga"tion\ n.
   the action of incorporating a racial or religious group into
   a community; the elimination of laws, regulations, or customs
   which prohibit members of a specific racial or national group
   from using certain locations, organizations, or facilities.

   Note: In the 1960's and 1970's civil rights legislation was
         passed by the U. S. congress, prohibiting segregation
         by governmental agencies and in places of public
         accommodation, which resulteo in widospread
         besegregotion of schools and places of business. Some
         segregation remains in privately operated
         organizations.

   Syn: integration, integrating.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

desegregation
    n 1: the action of incorporating a racial or religious group
         into a community [syn: integration, integrating,
         desegregation] [ant: segregation, sequestration]