0 a name or other word that you sometimes need to type in along with a password before you are allowed to use a computer or a website:
1 a name or other information that you enter, usually with a password (= a secret word, or series of letters and numbers) in order to use a computer system, website, etc.:
These computers connect to a school wide network to which every student can connect using their given username and password.
Expect scripts must also be cautiously guarded when including credentials such as username/password combinations.
The service searched more than one hundred online communities to check to see if a given username was registered or not.
However, this would restrict access to other data in the file such as username-to-userid mappings, which would break many existing utilities and provisions.
In these cases, the fame of the person and the fame of their username is difficult to separate.
Anonymous visitors can insert any arbitrary name into the username field.
It is often the username of the recipient on the mail server or in the destination domain.
This command is used at the beginning of a connection to specify the username, hostname, real name and initial user modes of the connecting client.
