A confirmation provides proof that something is true. An example might be when you receive confirmation that your flight will be on time, or you find out that something you thought might have happened actually did occur.

Confirmation is verification or final proof of something. In the church, confirmation is a rite in which a person if awarded full acceptance into — i.e., confirmed in — the religion, usually presented in a ceremony attended by family and friends. You can see how that ties in with the more general definition of substantiation of a fact or assertion. Confirmation is an obvious derivative of the verb confirm.

Definitions of confirmation
  1. noun
    information that confirms or verifies
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    reenforcement, reinforcement
    information that makes more forcible or convincing
    certification, corroboration, documentation
    confirmation that some fact or statement is true through the use of documentary evidence
    type of:
    info, information
    a message received and understood
  2. noun
    additional proof that something that was believed (some fact or hypothesis or theory) is correct
    “fossils provided further confirmation of the evolutionary theory”
    synonyms: check, substantiation, verification
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    bed check
    a check that everyone is in bed by the time they should be
    an instance of confirming something by considering information from several sources
    odd-even check, parity check, redundancy check
    a system of checking for errors in computer functioning
    a digit representing the sum of the digits in an instance of digital data; used to check whether errors have occurred in transmission or storage
    type of:
    cogent evidence, proof
    any factual evidence that helps to establish the truth of something
  3. noun
    making something valid by formally ratifying or confirming it
    confirmation of the appointment”
    synonyms: ratification
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    type of:
    the verbal act of agreeing
  4. noun
    a sacrament admitting a baptized person to full participation in the church
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    type of:
    a formal religious ceremony conferring a specific grace on those who receive it; the two Protestant ceremonies are baptism and the Lord's Supper; in the Roman Catholic Church and the Eastern Orthodox Church there are seven traditional rites accepted as instituted by Jesus: baptism and confirmation and Holy Eucharist and penance and holy orders and matrimony and extreme unction
  5. noun
    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
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    type of:
    religious ceremony, religious ritual
    a ceremony having religious meaning
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