Entry from US English dictionary
Concerning activities or conditions before the launch of a spacecraft, campaign, product, etc.
- The three-day event allows the crew to practice prelaunch activities, including launch pad safety training and a countdown dress rehearsal.
- The campaign was to be conducted in three stages: prelaunch, launch, and postlaunch.
- The practice countdown capped the week's Terminal Countdown Demonstration Test, in which flight crew members went through launch pad safety training and other prelaunch activities.
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