DETACHMENT
detachment, disengagement
(noun) the act of releasing from an attachment or connection
separation, breakup, detachment
(noun) coming apart
withdrawal, detachment
(noun) avoiding emotional involvement
detachment
(noun) a small unit of troops of special composition
insulation, insularity, insularism, detachment
(noun) the state of being isolated or detached; “the insulation of England was preserved by the English Channel”
Source: WordNet® 3.1
Etymology
Noun
detachment (countable and uncountable, plural detachments)
(uncountable) The action of detaching; separation.
(uncountable) The state of being detached or disconnected; insulation.
(uncountable) Indifference to the concerns of others; disregard; nonchalance; aloofness.
(uncountable) Absence of bias; impartiality; objectivity.
(uncountable, military) The separation of a military unit from the main body for a particular purpose or special mission.
(countable, military) The unit so dispatched.
(countable, military) A permanent unit organized for special duties.
(countable) Any smaller portion of a main body separately employed.
Source: Wiktionary
De*tach"ment, n. Etym: [Cf. F. détachement.]
1. The act of detaching or separating, or the state of being
detached.
2. That which is detached; especially, a body of troops or part of a
fleet sent from the main body on special service.
Troops . . . widely scattered in little detachments. Bancroft.
3. Abstraction from worldly objects; renunciation.
A trial which would have demanded of him a most heroic faith and the
detachment of a saint. J. H. Newman.
Source: Webster’s Unabridged Dictionary 1913 Edition