blackout

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Related to Black-Outs: fainting

blackout

1. a momentary loss of consciousness, vision, or memory
2. a temporary electrical power failure or cut
3. Electronics a temporary loss of sensitivity in a valve following a short strong pulse
4. a temporary loss of radio communications between a spacecraft and earth, esp on re-entry into the earth's atmosphere

blackout

[′blak‚au̇t]
(communications)
(electricity)
The shutting off of power in an electrical power transmission system, either deliberately or through failure of the system.

blackout

blackoutclick for a larger image
The relationship between acceleration and time at maximum G required to produce symptoms of grayout and blackout.
i. A condition of temporary loss of vision, possibly also loss of consciousness, resulting from the effect of high and sustained positive acceleration (g) on the body. A condition that occurs at g value higher than 1 that causes gray-out. Normally, this occurs when the body is exposed to +4 and +4.5 g for about 10 seconds or more. This can be postponed slightly by using a g-suit, by crouching, or by using a reclining seat. The onset of gray-out and blackout conditions varies from individual to individual. It is also dependent on physical conditioning.
ii. The fadeout of radio communications caused by changes in the ionosphere resulting from a nuclear explosion or ionospheric disturbances.
iii. An enforced period during which all lights in an area are turned off or concealed, so as not to be visible from the air. It is one of the passive air defense measures.

blackout

A complete loss of power. See brownout.
References in periodicals archive ?
When it is damaged by alcohol use, memory loss and black-outs can result.
The blast knocked out the island's biggest power plant at Vassiliko next to the base, causing black-outs in the capital Nicosia and at dozens of tourist resorts.
He said Valliday is due to see a neurologist about black-outs, and added: "There are a litany of gaps in the case.
She also navigated the number 14 from the garage to town, through the debris of bombed buildings, in the black-outs of the Blitz.
FBI men Joseph Fiennes and John Cho are still trying to work out why the worldwide black-outs happened and what all the visions meant.
She spent her married life caring for her husband, Donato, who suffered from epilepsy and was plagued by terrifying fits and black-outs.
Kevin Ash, 51, from Grangetown, Cardiff, said the band's upbeat music helped him pull out of a near-suicidal depression brought on by medical problems, including epilepsy, which causes him to have black-outs up to six times a day.
The youngster is believed to have had a history of black-outs.
McPhee, who had been complaining of black-outs, fled after the crash leaving Mr Brown, front seat passenger Mavis Lewin and her mother Doris Cameron injured at the scene.
Welsh football star Christian Edwards is still at a loss to explain the sudden black-outs which have put his career on hold.
He said Mrs Brain and her husband struggled to shake off symptoms of vomiting, headaches and black-outs for two years.
The illness meant he had to switch to a fast-acting insulin pump four years ago to control the "hypos" - attacks resulting from low blood sugar levels that sometimes led to black-outs.