Authenticator – Definition & Meaning

In today’s digital world, online security is of utmost importance. One of the ways to ensure security is by using an authenticator. But what exactly is an authenticator? In this article, we will explore the definition and meaning of authenticator, its origin, associations, synonyms, antonyms, root words, and example sentences.


An authenticator is a device or software application that generates a one-time password (OTP) or a code that is used to verify the identity of a user. It is used as a second layer of security, in addition to a password, to prevent unauthorized access to an account.


The word authenticator comes from the Latin word “authenticus” which means genuine or true. The word first appeared in the English language in the late 19th century.

Meaning in different dictionaries

According to the Merriam-Webster dictionary, an authenticator is “a device or program used to verify the identity of a user by generating a code or password that is valid for only a short time.”
The Oxford English Dictionary defines authenticator as “a device or code used to verify the identity of a user, typically by generating a one-time password or code.”


An authenticator is often associated with online security, two-factor authentication, and multi-factor authentication. It is commonly used by banks, social media platforms, and other online services to ensure the safety of user accounts.


Synonyms of authenticator include verifier, validator, authenticator app, authentication token, and security token.


Antonyms of authenticator include fake, counterfeit, unauthenticated, and fraudulent.

The same root words

Words that have the same root as authenticator include authenticate, authentication, and authenticity.

Example Sentences

  1. To access your account, you need to enter the code generated by the authenticator.
  2. The authenticator app on my phone provides an extra layer of security.
  3. Two-factor authentication requires a password and an authenticator code.
  4. The bank uses an authentication token to ensure the safety of its customers’ accounts.
  5. The counterfeit product was detected by an authenticator who identified the fake logo.
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