n.

1. 分离；分开[U]
   The wreck was caused by the detachment of two cars from the train.

   那次失事是因两节车厢与火车脱开造成的。

2. 派遣[U]
3. 分遣队；特遣舰队[C]
   A detachment of ten men remained behind to guard the prisoners.

   由十名士兵组成的分遣队留在后面看守囚犯。

4. 超脱；公平无私，不偏不倚[U]
   He was unable to examine the issue with detachment.

   他不能客观公正地调查这一问题。

n.

1. the state of being objective or aloof.
2. Military  a group of troops, ships, etc. sent away on a separate mission.
3. the action or process of detaching.