›the set of letters and numbers that you write on a computer screen in order to connect to a computer system: If you're worried about other people accessing your information, you can make it a private log-in.The site helps users keep track of their various logons.login data/informationDo not share your log-in information with anyone. → Compareusername
›the process of using a log-in to connect to a computer system: To help speed up log-in have your username and password ready.