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 (lĭft′ôf′, -ŏf′)
The initial movement by which or the instant in which a rocket or other such craft commences flight.


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


or lift′-off`,

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.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.liftoff - the initial ascent of a rocket from its launching padliftoff - the initial ascent of a rocket from its launching pad
rising, ascension, ascent, rise - a movement upward; "they cheered the rise of the hot-air balloon"


The act of rising in flight:
References in periodicals archive ?
New Moon Liftoff is a breeze to work with," said another beta user, Mike Altimus, senior systems analyst at Arizona State University East.
Unlike other thin-client solutions on the market, Liftoff utilizes a cooperative processing approach to Windows application execution, so that part of the Windows application runs on the NT server, and part of it runs on the Windows 95 or NT Workstation client.
Both vehicles are approximately 55 feet in overall length and weigh 50,000 pounds at liftoff, not including the satellite payload.
New Liftoff Product Partitions, Distributes Windows-Based Applications Across
LAS VEGAS, May 5 /PRNewswire/ -- Silicon Valley start-up New Moon Software today announced New Moon Liftoff 1.
Liftoff from the Space Center in Kourou, French Guiana, took place on Friday, July 8, 1994, at 8:05:32 p.
The first launch of the Boeing (NYSE:BA) Delta IV rocket was scrubbed this evening because, minutes before liftoff, launch officials detected that a fill valve on the liquid oxygen (LOX) tank did not close, therefore the LOX tank was not properly pressurizing.
MDT liftoff began the experimental flight vehicle's fourth consecutive successful flight.
The Alaska Tracker map displays the progress of Alaska Airlines and Horizon Air flights along their path, as well as flight number, aircraft type, flight liftoff time, estimated touchdown time, current aircraft speed and cruising altitude.
Total Atlas IIAS thrust at liftoff is 620,500 pounds.