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Definitions

Century Dictionary and Cyclopedia

  1. n. The act of authenticating, verifying, or establishing the authoritativeness, genuineness, validity, credibility, or truth of anything; specifically, in law, the official attestation of a written instrument.

Wiktionary

  1. n. something which validates or confirms the authenticity of something
  2. n. proof of the identity of a user logging on to some network
  3. n. a hallmark or assay-mark on a piece of metalwork

GNU Webster's 1913

  1. n. a mark on an article of trade to indicate its origin and authenticity.
  2. n. validating the authenticity of something or someone.

WordNet 3.0

  1. n. a mark on an article of trade to indicate its origin and authenticity
  2. n. validating the authenticity of something or someone

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‘authentication’ has been looked up 995 times, added to 2 lists, and has a Scrabble score of 19.