[lift-awf, -of]
Aeronautics, Rocketry.
the action of an aircraft in becoming airborne or of a rocket in rising from its launching site under its own power.
the instant when such action occurs.
Informal. the launching or commencement of a project, plan, etc.: The liftoff of the sales campaign will be next month.
that removes by lifting off; capable of being lifted off: a liftoff correction tape for typewriters; magnetized, liftoff nameplates.
Also, lift-off.

1955–60; noun, adj. use of verb phrase lift off Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
liftoff (ˈlɪftˌɒf)
1.  the initial movement or ascent of a rocket from its launch pad
2.  the instant at which this occurs
3.  (intr, adverb) (of a rocket) to leave its launch pad

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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Word Origin & History

"vertical take-off of a rocket, etc.," 1956, Amer.Eng., from lift (v.) + off.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
US early-warning satellites would have detected hot rocket exhaust soon after liftoff, but by then it would have been too late.
If the timing is right, day-trippers may also get the chance to meet an astronaut and even view a liftoff.
It's the first robot to achieve liftoff that's modeled on a fly and built on such a small scale.
The problem with the ground-up theory is the huge speed required to achieve liftoff.
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