Definition of unconsciousness noun from the Oxford Advanced American Dictionary

 

unconsciousness

 noun
noun
NAmE//ʌnˈkɑnʃəsnəs//
 
[uncountable]
 
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a state like sleep caused by injury or illness, when you are unable to use your senses He had lapsed into unconsciousness.
See the Oxford Advanced Learner's Dictionary entry: unconsciousness