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or chiefly Britishanaesthesia\ˌan-əs-ˈthē-zhə\
Medical Definition of anesthesia
1: loss of sensation especially to touch usually resulting from a lesion in the nervous system or from some other abnormality
2: loss of sensation and usually of consciousness without loss of vital functions artificially produced by the administration of one or more agents that block the passage of pain impulses along nerve pathways to the brain