Usually means: Enhanced security using two methods.
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We found 6 dictionaries that define the word two-factor authentication:

General (4 matching dictionaries)
  1. two-factor authentication: Merriam-Webster
  2. Two-factor authentication: Wikipedia, the Free Encyclopedia
  3. Two-factor authentication: World Wide Words
  4. two-factor authentication: Wiktionary

Computing (2 matching dictionaries)
  1. Two-Factor Authentication: Linktionary Networking Glossary
  2. two-factor authentication: Encyclopedia

Definitions from Wiktionary (two-factor authentication)

noun:  (computer security) An identity and access management security method in which users provide two different authentication factors to verify themselves: first the user's password and then a (randomly generated and frequently changing) code generated by an app.

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