- Temporary loss of consciousness due to decreased blood flow to the brain.
- Momentary loss of consciousness, as in absence.
- Temporary loss of vision, without alteration of consciousness, due to positive g (gravity) forces; caused by temporary decreased blood flow in the central retinal artery, and seen mostly in aviators.
- A transient episode that occurs during a state of intense intoxication (alcoholic blackout) of which the person has no recall, despite apparently having been conscious at the time.
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