A combination of a user's identification and password used to enter a computer, program, network, etc.
In plain English: A login is the unique name and password you use to get into an account on a computer or app.
"Please enter your username and password to complete the login."
Usage: Use "login" as a noun to refer specifically to the credentials, such as your username and password, that allow you to access an account or system. Do not use it for the action of signing in; instead, use the verb form "log in" with a space when describing the act of entering a system.
Misspelling of log in.
In plain English: To login means to enter your password and personal information so you can access an account or website.
"You need to enter your password to login before you can access your email."
Usage: Do not use "login" as a verb; instead, write two separate words, "log in," when describing the action of entering an account. The single-word form "login" should only be used as a noun to refer to the credentials themselves.
A surname.
"The Login family has been running that bakery for three generations, and their name is on every loaf of bread they sell."
The word login is a shortened form of the phrase log in, which originally meant to record one's arrival or departure at a location before evolving into its current digital sense of entering a system with credentials. It entered English as a convenient single-word alternative for the two-word action of signing on.