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Definition of authenticate:

  1. To prove authentic; to determine as real and true; as, to authenticate a portrait.
  2. To render authentic; to give authority to, by the proof, attestation, or formalities required by law, or sufficient to entitle to credit.

Synonyms:

vindicate, show, point to, evidence, vouch for, back, study atverify, justify, bear out, true, argue, assert, make/prove your/a point.

Usage examples: