noun (n)

• the act of validating; finding or testing the truth of something

  tindakan pengesahan; menemukan atau menguji kebenaran dari sesuatu

  Synonym:
  proof, substantiation
  

  source: wordnet30
• the cognitive process of establishing a valid proof

  the kognitif proses mendirikan sah bukti

  Synonym:
  establishment
  

  source: wordnet30
• The act of giving validity.

  tindakan memberikan sahih.

  source: webster1913