blastoff

[blast-awf, -of, blahst-]
noun Aerospace.
the launching of a rocket, guided missile, or spacecraft.

Origin:
1950–55; noun use of verb phrase blast off

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World English Dictionary
blastoff (ˈblɑːstˌɒf)
 
n
1.  the launching of a rocket under its own power
2.  the time at which this occurs
 
vb
3.  (adverb; when tr, usually passive) (of a rocket, spacemen, etc) to be launched

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Example sentences
It doesn't emulate weightlessness, though it will shake you up a bit in a
  blastoff simulation.
Today's blastoff of the latest rover raises an interesting question.
The blastoff of the lover raises an interesting question.
Problems with an unrelated launch, however, pushed the blastoff back.
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