1. [syn: log in, log on, log-in]
The Collaborative International Dictionary of English v.0.48:
log in \log in\, log on \log on\, v. i. (Computers)
To establish communication with a host computer from a
terminal or remote computer.
WordNet (r) 3.0 (2006):
v 1: enter a computer; "Have you logged in lately?" [syn: log
in, log on, log-in] [ant: log off, log out]
The Free On-line Dictionary of Computing (30 December 2018):
(Or "login", "log on", "logon") To start a
session with a system, usually by giving a user name and
password as a means of user authentication. The term is
also used to mean the ability to access a service (also called
an account), e.g. "Have you been given a login yet?"
"Log in/on" is occasionally misused to refer to starting a
session where no authorisation is involved, or to access where
there is no session involved. E.g. "Log on to our Web
"login" is also the Unix program which reads and verifies a
user's user name and password and starts an interactive
The noun forms are usually written as a single word whereas
the verb forms are often written as two words.
To end a session is to "log out" or "off".