Definition of blastoff in English:
The launching of a rocket or spacecraft.
- The space shuttle is counting down for blast-off, with managers confident that last minute hitches would not delay today's launch.
- The camera played a critical role in the diagnostic equipment that made sure the shuttle's twin booster rockets were safe for blast-off.
- The rocket has been greenlighted for blast-off tomorrow from the spaceport in French Guiana.