Origin: French suffix -ier
Identifier has 2 different meanings across 1 category:
a symbol that establishes the identity of the one bearing it
"The unique badge served as an identifier, clearly establishing the security guard's authority within the restricted zone."
Someone who identifies; a person who establishes the identity of.
"The security officer acted as an identifier, verifying the traveler's passport before allowing entry."
In plain English: An identifier is something used to tell people apart from each other, like your name or student ID number.
"The driver used their license number as an identifier to enter the secure parking garage."
Usage: In everyday contexts, an identifier usually refers to something used to establish or verify identity rather than a person performing that action. Use this term when describing unique data points like usernames or codes instead of synonyms such as "recognizer" which implies detection without verification.
The word identifier comes from the verb identify combined with the suffix -er. It was formed to describe a person or thing that performs the action of identifying something else.