detachment vs unison

detachment

noun
  • 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. 

  • Absence of bias; impartiality; objectivity. 

  • Any smaller portion of a main body separately employed. 

unison

noun
  • A sound or note having the same pitch as another, especially when used as the base note for an interval; a unison string. 

  • The state of being in harmony or agreement; harmonious agreement or togetherness, synchronisation. 

  • Identical pitch between two notes or sounds; the simultaneous playing of notes of identical pitch (or separated by one or more octaves). 

  • Two or more voices speaking the same words together. 

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