Source : Webster's Revised Unabridged Dictionary (1913)

Confirmation \Con`fir*ma"tion\, n. [F. confirmation, L.
   confirmatio.]
   1. The act of confirming or strengthening; the act of
      establishing, ratifying, or sanctioning; as, the
      confirmation of an appointment.

            Their blood is shed In confirmation of the noblest
            claim.                                --Cowper.

   2. That which confirms; that which gives new strength or
      assurance; as to a statement or belief; additional
      evidence; proof; convincing testimony.

            Trifles light as air Are to the jealous
            confirmations strong As proofs of holy writ. --Shak.

   3. (Eccl.) A rite supplemental to baptism, by which a person
      is admitted, through the laying on of the hands of a
      bishop, to the full privileges of the church, as in the
      Roman Catholic, the Episcopal Church, etc.

            This ordinance is called confirmation, because they
            who duly receive it are confirmed or strengthened
            for the fulfillment of their Christian duties, by
            the grace therein bestowed upon them. --Hook.

   4. (Law) A conveyance by which a voidable estate is made sure
      and not voidable, or by which a particular estate is
      increased; a contract, express or implied, by which a
      person makes that firm and binding which was before
      voidable.

Source : WordNet®

confirmation
     n 1: additional proof that something that was believed (some fact
          or hypothesis or theory) is correct; "fossils provided
          further confirmation of the evolutionary theory" [syn: {verification},
           {check}, {substantiation}]
     2: information that confirms or verifies
     3: making something valid by formally ratifying or confirming
        it; "the ratification of the treaty"; "confirmation of the
        appointment" [syn: {ratification}]
     4: 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
     5: a sacrament admitting a baptized person to full
        participation in the church