From identify + -er.

identifier (plural identifiers)

1. Someone who identifies; a person who establishes the identity of someone or something.
   • 2007, Paolo Tombesi, Osamu Hirota, Quantum Communication, Computing, and Measurement 3, page 291:

     Here, we would use the anonymous key technique to obtain a quantum identification protocol AKI of the challenge-response type in which the identifier cannot pretend to be the identifiee […]

2. Something that identifies or uniquely points to something or someone else.
3. One who identifies as a particular type or role; one who says and believes that they are a certain thing.
4. A guidebook that helps determine the specific class of an object (such as a mushroom, herb, fish, bird, drug, or mineral), or its individual identity (such as that of a star).
5. (programming, operating systems) A formal name used in source code to refer to a variable, function, procedure, package, etc. or in an operating system to refer to a process, user, group, etc.
6. (HTML) A code that distinguishes a particular element from all other elements in a document.
7. (databases) A primary key.

• identifiee

• French: identificateur
• German: Identifikator, Kennzeichen
• Italian: identificatore
• Portuguese: identificador
• Russian: идентифика́тор
• Spanish: identificador

• French: identifiant
• Russian: идентифика́тор