autostart noun 2verb 1forms 3 noun2 •(An instance of) automatic starting. •A program or application set to start automatically.Vundo installs two autostarts—one a WinLogon Notify and the other a BHO—that reference the same randomly named infective DLL file. — 2006 verb1 •To start automatically. formsautostarted · autostarting · autostarts