liftoff

or lift-off

[ lift-awf, -of ]
/ ˈlɪftˌɔf, -ˌɒf /

noun

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.
Informal. the launching or commencement of a project, plan, etc.: The liftoff of the sales campaign will be next month.

adjective

that removes by lifting off; capable of being lifted off: a liftoff correction tape for typewriters; magnetized, liftoff nameplates.

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. 2019

Examples from the Web for liftoff

British Dictionary definitions for liftoff

liftoff

/ (ˈlɪftˌɒf) /

noun

the initial movement or ascent of a rocket from its launch pad
the instant at which this occurs

verb lift off

(intr, 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