prerelease

adj

1. (not-comparable)Before release.

   “They were aided by beta testers, ordinary people outside the company who were willing to try prerelease software and report bugs […]”

   “In both years, only 10 to 12 percent had participated in formal prerelease programs designed to prepare prisoners for the transition from life in prison […]”

noun

1. A preliminary version of a work, released in advance.
2. An inadvertent (premature) release of a skiboot from the bindings of a ski, caused by excessive vibration, such as going over an extremely bumpy piste.

verb

1. To release in advance