1. preinstall - Adjective
2. preinstall - Verb
preinstall (third-person singular simple present preinstalls, present participle preinstalling, simple past and past participle preinstalled)
(transitive) To install (software, etc.) in advance.
My computer came with the operating system preinstalled.
preinstall (not comparable)
(computing) Prior to installation.
I can't install this software because one of the preinstall checks failed.