
1) Activity preceding liftoff 2) American young adult novel 3) Autobot 4) British comic 5) British game show 6) British science fiction 7) Canaveral arithmetic 8) Canaveral procedure 9) Comic based on Doctor Who 10) Count 11) Counting 12) DOS game 13) Enumeration 14) Exclusively Anglo word 15) Exclusively Saxon word
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https://www.crosswordclues.com/clue/countdown

A countdown is a sequence of backward counting to indicate the time remaining before an event is scheduled to occur. NASA commonly employs the term `T-minus` during the preparation for and anticipation of a rocket launch, and even `E-minus` for events that involve spacecraft that are already in space, where the `T` could stand for `Test` o...
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http://en.wikipedia.org/wiki/Countdown
[MuchMusic] The MuchMusic Top 30 Countdown is a two hour music video program block, that airs on Canadian music television station MuchMusic. Countdown is one of the oldest programs that continues to be aired on MuchMusic since its debut. Originally sponsored by Coca-Cola, it was known for the first several years as the Coca-Cola Countdown....
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http://en.wikipedia.org/wiki/Countdown_(MuchMusic)
[Polystyle Publications] Countdown was a British comic published weekly by Polystyle Publications – ultimately, under several different titles – from 1971 to 1973. The pages in each issue were numbered in reverse order, with page 1 at the end – a gimmick which was derived from the comic`s title in order to create a `countdown` to the ...
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http://en.wikipedia.org/wiki/Countdown_(Polystyle_Publications)
[Rush song] Countdown is a Rush song that describes the launch of STS-1 and the Space Shuttle Columbia as the group watched from a VIP area called Red Sector A at the time. The song incorporates audio from voice communications between astronauts John W. Young and Robert Crippen and ground control along with commentary from the Kennedy Space...
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http://en.wikipedia.org/wiki/Countdown_(Rush_song)
[Transformers] Countdown is the name fictional character in the Transformers series. He was introduced as a toy in the US 1989, but his first appearance in fiction was in the Japanese Transformers: Zone series where he was called Moon Raider. He didn`t appear in US Transformers fiction until his role as a main character in the Dreamwave com...
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http://en.wikipedia.org/wiki/Countdown_(Transformers)
[game show] Countdown is a British game show involving word and number puzzles. It is produced by ITV Studios and broadcast on Channel 4. It is presented by Nick Hewer, assisted by Rachel Riley, with regular lexicographer Susie Dent. It was the first programme to be aired on Channel 4, and 70 series have been broadcast since its debut on 2 ...
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http://en.wikipedia.org/wiki/Countdown_(game_show)
[supermarket] Countdown is a New Zealand full-service supermarket chain, owned by Woolworths Limited. Founded in 1981, Countdown is the flagship brand of Progressive Enterprises, Woolworths` New Zealand supermarket subsidiary, with over 160 supermarkets across New Zealand. It is the largest single supermarket chain in New Zealand in terms o...
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http://en.wikipedia.org/wiki/Countdown_(supermarket)
[video game] Countdown is a point-and-click adventure game released by Access Software for MS-DOS in 1990. The player plays as Mason Powers, a CIA agent who wakes up in a Turkish mental hospital, suffering from partial amnesia and accused of murdering his supervisor. Powers must escape the hospital, find out who framed him, piece together h...
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http://en.wikipedia.org/wiki/Countdown_(video_game)

A count in inverse numerical order, in hours, minutes and finally seconds, of time remaining before the launch of a rocket.
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http://www.braeunig.us/space/glossary.htm

Listen to the final countdown of Apollo 11 The step-by-step process leading to a launch. It runs according to a prearranged schedule, measured in terms of T-time (T minus time before the engine start sequence begins and T plus time thereafter). T-0:00:00 is not necessarily the liftoff point,...
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http://www.daviddarling.info/encyclopedia/C/countdown.html

[
n] - counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle)
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http://www.webdictionary.co.uk/definition.php?query=countdown
noun counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle)
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https://www.encyclo.co.uk/local/20974

the backward counting in fixed time units from the initiation of a project, as a rocket launching, with the moment of firing designated as zero. · the final preparations made during this period. · a period of increasing activity, tension, or anxiety, as before a deadline.
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https://www.infoplease.com/dictionary/countdown
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