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liftoff

[lift-awf, -of] /ˈlɪftˌɔf, -ˌɒf/
noun
1.
Aeronautics, Rocketry.
  1. the action of an aircraft in becoming airborne or of a rocket in rising from its launching site under its own power.
  2. the instant when such action occurs.
2.
Informal. the launching or commencement of a project, plan, etc.:
The liftoff of the sales campaign will be next month.
adjective
3.
that removes by lifting off; capable of being lifted off:
a liftoff correction tape for typewriters; magnetized, liftoff nameplates.
Origin of liftoff
1955-1960
1955-60; noun, adj. use of verb phrase lift off
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for liftoff

liftoff

/ˈlɪftˌɒf/
noun
1.
the initial movement or ascent of a rocket from its launch pad
2.
the instant at which this occurs
verb
3.
(intransitive, adverb) (of a rocket) to leave its launch pad
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for liftoff
n.

also lift-off, "vertical take-off of a rocket, etc.," 1956, American English, from lift (v.) + off.

Online Etymology Dictionary, © 2010 Douglas Harper
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