loss of consciousness

English Thesaurus

1. the occurrence of a loss of the ability to perceive and respond (noun.event)

hypernym	:	alteration, change, modification,
definition	:	an event that occurs when something passes from one state or phase to another (noun.event)

hyponym	:	deliquium, faint, swoon, syncope,
definition	:	a spontaneous loss of consciousness caused by insufficient blood to the brain (noun.event)