Definition of triage noun from the Oxford Advanced Learner's Dictionary

 

triage

 noun
noun
BrE BrE//ˈtriːɑːʒ//
 
; NAmE NAmE//triːˈɑːʒ//
 
[uncountable] Hospitals
 
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(in a hospital) the process of deciding how seriously ill/sick or injured a person is, so that the most serious cases can be treated first See related entries: Hospitals Word Origin early 18th cent. (in the sense ‘the action of sorting items according to quality’): from French, from trier ‘separate out’. The current sense dates from the 1930s, from the military system of assessing the wounded on the battlefield.
See the Oxford Advanced American Dictionary entry: triage