See also: log off English Etymology Deverbal from log off. Noun logoff (plural logoffs) (computing) The process or an instance of logging off. Synonyms: logout, signoff, sign-off, signout, sign-out Antonyms: login, log-in, logon, log-on, sign-in, sign-on Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads