Source : WordNet®

blackout
     n 1: a suspension of radio or tv broadcasting
     2: darkness resulting from the extinction of lights (as in a
        city invisible to enemy aircraft) [syn: {brownout}, {dimout}]
     3: the failure of electric power for a general region
     4: a momentary loss of consciousness
     5: partial or total loss of memory; "he has a total blackout
        for events of the evening" [syn: {amnesia}, {memory loss}]