Usually means: Verifier of user identity access.
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We found 19 dictionaries that define the word authenticator:

General (15 matching dictionaries)
  1. authenticator: Merriam-Webster.com
  2. authenticator: Oxford Learner's Dictionaries
  3. authenticator: Collins English Dictionary
  4. authenticator: Vocabulary.com
  5. Authenticator, authenticator: Wordnik
  6. authenticator: Wiktionary
  7. authenticator: Infoplease Dictionary
  8. authenticator: Dictionary.com
  9. Authenticator: Wikipedia, the Free Encyclopedia
  10. authenticator: Rhymezone
  11. authenticator: Free Dictionary
  12. authenticator: Mnemonic Dictionary
  13. authenticator: Dictionary/thesaurus

Business (1 matching dictionary)
  1. authenticator: Legal dictionary

Computing (1 matching dictionary)
  1. authenticator: Encyclopedia

Miscellaneous (1 matching dictionary)
  1. Navajo Code Talkers' Dictionary (No longer online)

Tech (1 matching dictionary)
  1. DOD Dictionary of Military Terms (No longer online)

(Note: See authenticate as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (agent noun) One who, or something which, authenticates, as:
noun:  An app that uses applied cryptography to prove someone's identity to a network connection.
noun:  A feature that shows something to be authentic.
noun:  (film, television) A person employed to check the accuracy and realism of a script.

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