Wiktionary
prelaunch
a. preparatory to launch
Usage examples of "prelaunch".
He had been asked the exact same thing during every prelaunch sequence since coming to work at the Guianan Space Center five years before.
The flight crew were on their backs, going through the final items on the prelaunch checklist with no wasted motion.
He ran through his prelaunch routine automatically, consciously tensing and untensing his muscles, giving his ejection seat harness one last tug to make sure it was secure.