noun
username
noun
1
A name someone chooses to identify themselves when logging into a computer system, app, or website.
"Enter your username and password to sign in."
"Your username has to be unique — that one is already taken."
How to Use Username
Learner’s notesIn plain EnglishThe name you use to log in somewhere, as opposed to your real name.
Easily confused with
Word Forms
usernames plural
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Enter your _____ and password to sign in.
Etymology
From user + name.