the act of detaching.
the condition of being detached.
aloofness, as from worldly affairs or from the concerns of others.
freedom from prejudice or partiality.
the act of sending out a detached force of troops or naval ships.
the body of troops or ships so detached.

1660–70; < French détachement. See detach, -ment

nondetachment, noun
predetachment, noun

3. coolness, indifference, unconcern. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
detachment (dɪˈtætʃmənt)
1.  indifference to other people or to one's surroundings; aloofness
2.  freedom from self-interest or bias; disinterest
3.  the act of disengaging or separating something
4.  the condition of being disengaged or separated; disconnection
5.  military
 a.  the separation of a small unit from its main body, esp of ships or troops
 b.  the unit so detached
6.  (Canadian) a branch office of a police force
7.  logic See also modus ponens the rule whereby the consequent of a true conditional statement, given the truth of its antecedent, may be asserted on its own

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1660s, "action of detaching," from Fr. détachement (17c.), from détacher (see detach). Meaning "portion of a military force" is from 1670s; that of "aloofness from objects or circumstances" is from 1798.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

detachment de·tach·ment (dĭ-tāch'mənt)

  1. The act or process of disconnecting or detaching; separation.

  2. The state of being separate or detached.

  3. Indifference to or remoteness from the concerns of others; aloofness.

  4. Absence of prejudice or bias; disinterest.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Retinal detachment repair is eye surgery to place a detached retina back into
  its normal position.
The statement is childishly idealistic and lacks the proper level of critical
  detachment needed in a serious scholar.
Yet he is taunted by the suspicion that his detachment is inhuman.
Pop culture is full of characters who approach ghosts with scientific
  detachment instead of terror.
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