noun (n)

• additional proof that something that was believed (some fact or hypothesis or theory) is correct(noun.cognition)

  Example:
  Fossils provided further confirmation of the evolutionary theory.
  

  Synonym:
  check, substantiation, verification
  

  source: wordnet30
• information that confirms or verifies(noun.communication)

  source: wordnet30
• making something valid by formally ratifying or confirming it(noun.communication)

  Example:
  Confirmation of the appointment.
  

  Synonym:
  ratification
  

  source: wordnet30
• a ceremony held in the synagogue (usually at Pentecost) to admit as adult members of the Jewish community young men and women who have successfully completed a course of study in Judaism(noun.act)

  source: wordnet30
• a sacrament admitting a baptized person to full participation in the church(noun.act)

  source: wordnet30
• The act of confirming or strengthening; the act of establishing, ratifying, or sanctioning; as, the confirmation of an appointment.(noun)

  source: webster1913