liftoff

Definition of Liftoff in English :

1. liftoff

the initial ascent of a rocket from its launching pad

WordNet Lexical Database for English. Princeton University. 2010.

Liftoff

noun

1.

the initial movement or ascent of a rocket from its launch pad

2.

the instant at which this occurs

verb lift off

3. (intr, adverb)

(of a rocket) to leave its launch pad

noun

1.

the initial vertical takeoff of a rocket, helicopter, etc.

2.

the moment at which this occurs

n.

The initial movement by which or the instant in which a rocket or other such craft commences flight.