Used attributively before a noun to denote relation to the launch of a rocket or the beginning of an activity.
Definitions
Relating to, occurring at, or suitable for the launch of a rocket, missile, or spacecraft. Engineers calculated the blastoff velocity required to escape Earth's gravity.
Exclamation used to announce or signal the start of a launch or any energetic beginning.
Definitions
Used to announce or signal the launch of a rocket or, figuratively, the start of any undertaking. "Five, four, three, two, one—blastoff!" shouted the mission commander.
Synonyms
here we go!
and we're off!
let's roll!
ready, set, go!
away we go!
fire away!