What is the meaning of confirm?

verb

• Establish or strengthen as with new evidence or facts.
  • usage: "his story confirmed my doubts"; "The evidence supports the defendant"
  • synonyms: corroborate, sustain, substantiate, support, affirm
• Strengthen or make more firm.
  • usage: "The witnesses confirmed the victim's account"
  • synonyms: reassert
• Make more firm.
  • usage: "Confirm thy soul in self-control"
• Support a person for a position.
  • usage: "The Senate confirmed the President's candidate for Secretary of Defense"
• Administer the rite of confirmation to.
  • usage: "the children were confirmed in their mother's faith"