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

1950–55; noun use of verb phrase blast off Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
blastoff (ˈblɑːstˌɒf)
1.  the launching of a rocket under its own power
2.  the time at which this occurs
3.  (adverb; when tr, usually passive) (of a rocket, spacemen, etc) to be launched

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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.
Image for blastoff
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