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liftoff

or lift-off

[lift-awf, -of]
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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.
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adjective
  1. that removes by lifting off; capable of being lifted off: a liftoff correction tape for typewriters; magnetized, liftoff nameplates.
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Origin of liftoff

First recorded in 1955–60; noun, adj. use of verb phrase lift off
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for liftoff

liftoff

noun
  1. the initial movement or ascent of a rocket from its launch pad
  2. the instant at which this occurs
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verb lift off
  1. (intr, adverb) (of a rocket) to leave its launch pad
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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

Word Origin and History for liftoff

n.

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

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Online Etymology Dictionary, © 2010 Douglas Harper