What is the meaning of verifying?

verb

• Confirm the truth of.
  • usage: "Please verify that the doors are closed"; "verify a claim"
  • synonyms: verify
• Check or regulate (a scientific experiment) by conducting a parallel experiment or comparing with another standard.
  • usage: "Are you controlling for the temperature"
  • synonyms: control, verify
• Attach or append a legal verification to (a pleading or petition.
  • synonyms: verify
• To declare or affirm solemnly and formally as true.
  • usage: "Before God I swear I am innocent"
  • synonyms: affirm, verify, assert, avow, aver, swan, swear

adjective

• Serving to support or corroborate.
  • usage: "collateral evidence"
  • synonyms: collateral, confirmative, confirming, confirmatory, corroborative, corroboratory, substantiating, substantiative, validating, validatory, verificatory