Pronunciation: (lift'ôf", -of"), [key]
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.
that removes by lifting off; capable of being lifted off: a liftoff correction tape for typewriters; magnetized, liftoff nameplates. Also,lift'-off".
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.