variants: or less commonly log in
logged on also logged in; logging on also logging in; logs on also logs in
Definition of log on
: to establish communication and initiate interaction with a computer or system When you log on, you are taken to your "slimming apartment"; it's a virtual world, kind of like the Sims game …— Gill Sutherland … that voters from Iowa, New Hampshire, and Ohio will see different pages when they log in.— Dana Milbank —often used with to log in to the mainframeAfter a hellish day at work or spat with your guy, you log on to Facebook …— Jessica Knoll —often written as log onto and log into … a so-called portal, the site that greets users when they first log onto the Internet.— Katie Hafner… almost seven million paying subscribers, who can log into the game and interact with other players.— Seth Schiesel
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