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authentication (EN)
noun

noun “authentication”

singular authentication, plural authentications or uncountable
  1. (computing) the process of verifying the identity of a user or device
    The system requires authentication before you can log in.
  2. the act of confirming that something is genuine or valid
    They needed authentication of the documents before proceeding.
  3. a mark or stamp that shows that something is genuine
    The antique silverware had an authentication engraved on the handle.