FromFrenchdétachement. Bysurface analysis,detach +‎-ment.

• IPA^(key):/dɪˈtæt͡ʃmənt/

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• Hyphenation:de‧tach‧ment

detachment (countable anduncountable,pluraldetachments)

1. (uncountable) The action ofdetaching;separation.
   • 1944 November and December, T. F. Cameron, “Motor and Cartage Working”, inRailway Magazine, page335:

     But the horse has left his mark, for his successor is a mechanical horse designed to a large extent to copy the leading characteristics of the live horse; easy attachment to ordetachment from its load, a small turning circle, a small appetite for petrol, but giving a much higher acceleration and speed, and so capable of much greater distances, so that fewer cartage units are required.

2. (uncountable) The state of being detached ordisconnected;insulation.
3. (uncountable)Indifference to the concerns of others;disregard;nonchalance;aloofness.
4. (uncountable) Absence ofbias;impartiality;objectivity.
5. (uncountable,military) The separation of amilitaryunit from the main body for a particular purpose or special mission.
6. (countable,military) The unit sodispatched.
   • 1958,A. V. H. Hartendorp,History of Industry and Trade of the Philippines: The Magsaysay Administration‎^[1],→OCLC, page218:

     Vietnamese sovereignty over the Paracels dated back at least to the early 19th century, when Emperor Gia-Long sent adetachment to Hoang Sa Island, it remained until the establishment of French protectorate over Annam, when France assumed responsibility for the islands.

7. (countable,military) Apermanent unit organized for specialduties.
8. (countable) Any smallerportion of a main bodyseparately employed.