log in
phrasal verb with log verb [ T ] uk/lɒɡ/ us-gg-
(also log on) [ I or T ] IT, INTERNET
to connect to a computer system by putting in a particular set of letters or numbers:
What is the user name and password that you use to log on?
If you are already a registered user, please log in.
log in/on to sth Find out more about our products by logging on to our website.
log in/on to do sth It has 1.7 million registered customers who log in to play games and socialize.
log sb in/on Your network administrator will log you in the first time you use the system.
See also
log-in
log-on