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authenticator

[aw-then-ti-key-ter]
noun
  1. a person or thing that authenticates.
  2. Cryptography. a code used to authenticate a previously transmitted code.
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Origin of authenticator

First recorded in 1860–65; authenticate + -or2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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