/lift"awf', -of'/ , n.
1. Aeron. , Rocketry.
a. the action of an aircraft in becoming airborne or of a rocket in rising from its launching site under its own power.
b. 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.
adj.
3. that removes by lifting off; capable of being lifted off: a liftoff correction tape for typewriters; magnetized, liftoff nameplates.
Also, lift-off .
[ 1955-60; n., adj. use of v. phrase lift off ]