noun Also log-in, logon.
verb (used without object)
And yet, this gluing together of terms like login, logon, backup, and setup as verbs is common, especially in writing about computers. Not for everyone, however. Some well-known software companies, for example, carefully maintain the distinction in their programs and documentation.
But habits are difficult to change. Those who react to the one-word verb as an error will probably have to get used to it, and those who use the one-word verb will have to recognize that others will see it and wince.
Examples from the Web for login
My login is my junior-high AOL screen name, which I always told people came from a nickname on the basketball team.
Were they going to use the word ‘login,’ or ‘handle,’ or something technical like that?
Login to your account and check to see what fund the money is in.
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I'd like you to tell me your login and password for your Pirate Party email, please?
"Your login and password," she said, looking a little surprised.
I saw Severe Haircut Woman's face, saw her smirk as she asked me for my login.
Word Origin and History for login
in the computer sense, as one word, by 1983, from log in.