segregation

noun

1. The setting apart or separation of things or people, as a natural process, a manner of organizing people that may be voluntary or enforced by law.
2. The setting apart in Mendelian inheritance of alleles, such that each parent passes only one allele to its offspring.
3. Separation from a mass, and gathering about centers or into cavities at hand through cohesive or adhesive attraction or the crystallizing process.
4. (public policy) The separation of people (geographically, residentially, or in businesses, public transit, etc) into racial or other categories (e.g. religion, sex).