/ dɪˈtætʃmənt; NAmE / noun
1.
[ U ] the state of not being involved in sth in an emotional or personal way :
He answered with an air of detachment.
She felt a sense of detachment from what was going on.
OPP involvement
2.
[ U ] ( approving ) the state of not being influenced by other people or by your own feelings :
In judging these issues a degree of critical detachment is required.
3.
[ C ] a group of soldiers, ships, etc. sent away from a larger group, especially to do special duties :
a detachment of artillery
4.
[ U ] the act of detaching sth; the process of being detached from sth :
to suffer detachment of the retina
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WORD ORIGIN
mid 17th cent.: from French détachement , from détacher to detach, earlier destacher , from des- (expressing reversal) + attacher attach.