deinstall Syllabification: (de·in·stall)Pronunciation: /ˌdē-inˈstôl/ (British also deinstal)Definition of deinstall verb (deinstalls or Britishdeinstals, deinstalling, deinstalled) [with object] uninstall. humorous dismiss from employment:the company lost funding and I was deinstalledDerivatives deinstallationPronunciation: /ˌdē-instəˈlāSHən/ noun deinstaller noun deinstall in other Oxford dictionaries Definition of deinstall in the British & World English dictionary