cohort vs detachment

cohort

noun
  • An accomplice; abettor; associate. 

  • A demographic grouping of people, especially those in a defined age group, or having a common characteristic. 

  • Any division of a Roman legion, normally of about 500 or 600 men (equalling about six centuries). 

  • Any band or body of warriors. 

  • A group of people supporting the same thing or person. 

  • A set of individuals in a program, especially when compared to previous sets of individuals within the same program. 

  • A natural group of orders of organisms, less comprehensive than a class. 

  • A colleague. 

verb
  • To associate with such a group 

detachment

noun
  • Absence of bias; impartiality; objectivity. 

  • 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. 

  • The action of detaching; separation. 

  • Any smaller portion of a main body separately employed. 

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