blackout

(redirected from Black-Out)
Also found in: Dictionary, Thesaurus, Medical, Financial, Idioms, Wikipedia.

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 ?
Some Cairenes ironically refer to the black-outs to as 'Sisi time', because of the speech where El Sisi announced his presidential candidacy and called on all citizens to tighten their belts for the good of the nation.
Some councils have favoured street-lighting black-outs after midnight, so why does the Senedd illuminate the sky every night?
NEARLY a quarter of Scots revellers have drunken black-outs at the office Christmas party, it was claimed yesterday.
This policy is unpopular and a vote loser because the public know that wind energy will lead us into power black-outs and costly energy, apart from the destruction of our countryside in a futile attempt to alter global climate change.
The Dunedin City Council and the Otago Cricket Association say the concept mirrors "black-outs" created during the All Blacks' games in the city.
Powertherm will eliminate the possibility of brown or black-outs as well as improve the quality of power delivered to businesses.
Though meant to be performed in sequence with short black-outs between each, they can be mixed, matched, or rearranged in any form the director likes.
BRITAIN could face widespread black-outs unless there is urgent investment in a new fleet of gas-fired power stations, MPs warned last night.
Roberta Hemmings said her son, who divorced 25 years ago, suffered from black-outs after a cycling accident about three years ago.
BLACK-OUTS affecting thousands of homes in south Warwickshire caused chaos in Stratford, Warwick and Kenilworth last night.
As a means of remedying the frequent black-outs and various electricity generation problems, Government has passed a motion that will convert the money owed by the BVI Electricity Corp.
He said Mrs Brain and her husband had struggled to shake off symptoms of vomiting, headaches and black-outs over a two-year period.