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The initial movement by which or the instant in which a rocket or other such craft commences flight.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Astronautics) the initial movement or ascent of a rocket from its launch pad
2. (Astronautics) the instant at which this occurs
(Astronautics) (intr, adverb) (of a rocket) to leave its launch pad
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||liftoff - the initial ascent of a rocket from its launching pad|
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
The act of rising in flight:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.