user ID
- 01 A2 Elementary
a unique name you use to identify yourself when logging into a website or app.
a unique alphanumeric string used to identify a specific individual during the authentication process on a digital platform.
Simple“Please enter your user ID and password to access your bank account.”
In context“The system administrator requested that all employees update their user ID to follow the new security protocol for remote access.”
- 02 B2 Upper Intermediate
a unique number that a computer system uses to track a specific person.
a unique numeric identifier assigned by an operating system or database to distinguish between different accounts.
Simple“The database uses a unique user ID to keep track of every customer's orders.”
In context“The backend logs recorded the error alongside the specific user ID, allowing the developers to trace the fault to a specific account configuration.”
SynonymsUIDidentifier
A compound formed from the noun user and the initialism ID, which stands for identification. It follows the established linguistic pattern of combining a functional role with a shortened form of identity documentation.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.