detachment vs segregation

detachment

noun
  • The action of detaching; separation. 

  • A permanent unit organized for special duties. 

  • Indifference to the concerns of others; disregard; nonchalance; aloofness. 

  • The state of being detached or disconnected; insulation. 

  • The separation of a military unit from the main body for a particular purpose or special mission. 

  • The unit so dispatched. 

  • Absence of bias; impartiality; objectivity. 

  • Any smaller portion of a main body separately employed. 

segregation

noun
  • 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. 

  • The separation of people (geographically, residentially, or in businesses, public transit, etc) into racial or other categories (e.g. religion, sex). 

  • The setting apart in Mendelian inheritance of alleles, such that each parent passes only one allele to its offspring. 

  • Separation from a mass, and gathering about centers or into cavities at hand through cohesive or adhesive attraction or the crystallizing process. 

  • The separation of a pair of chromatids or chromosomes during mitosis and meiosis 

  • The separation of people (geographically, residentially, or in businesses, public transit, etc) into various categories which occurs due to social forces (culture, etc). 

How often have the words detachment and segregation occurred in a corpus of books? (source: Google Ngram Viewer )